merge: 合并远程分支并修复代码冲突

合并了远程分支 cb72262a 的功能更新，同时保留了 ESLint 修复：

**冲突解决详情：**

1. AccountTableFilters.vue
   - ✅ 保留 emit 模式修复（避免 vue/no-mutating-props 错误）
   - ✅ 添加第三个筛选器 type（账户类型）
   - ✅ 新增 antigravity 平台和 inactive 状态选项

2. UserBalanceModal.vue
   - ✅ 保留 console.error 错误日志
   - ✅ 添加输入验证（金额校验、余额不足检查）
   - ✅ 使用 appStore.showError 向用户显示友好错误

3. AccountsView.vue
   - ✅ 保留所有 console.error 错误日志（避免 no-empty 错误）
   - ✅ 使用新 API：clearRateLimit 和 setSchedulable

4. UsageView.vue
   - ✅ 添加 console.error 错误日志
   - ✅ 添加图表功能（模型分布、使用趋势）
   - ✅ 添加粒度选择（按天/按小时）
   - ✅ 保留 XLSX 动态导入优化

**测试结果：**
- ✅ Go tests: PASS
- ✅ golangci-lint: 0 issues
- ✅ ESLint: 0 errors
- ✅ TypeScript: PASS

🤖 Generated with [Claude Code](https://claude.com/claude-code

)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/internal/handler/admin/group_handler.go

@@ -33,6 +33,10 @@ type CreateGroupRequest struct {
 	DailyLimitUSD    *float64 `json:"daily_limit_usd"`
 	WeeklyLimitUSD   *float64 `json:"weekly_limit_usd"`
 	MonthlyLimitUSD  *float64 `json:"monthly_limit_usd"`
+	// 图片生成计费配置（antigravity 和 gemini 平台使用，负数表示清除配置）
+	ImagePrice1K *float64 `json:"image_price_1k"`
+	ImagePrice2K *float64 `json:"image_price_2k"`
+	ImagePrice4K *float64 `json:"image_price_4k"`
 }
 
 // UpdateGroupRequest represents update group request
@@ -47,6 +51,10 @@ type UpdateGroupRequest struct {
 	DailyLimitUSD    *float64 `json:"daily_limit_usd"`
 	WeeklyLimitUSD   *float64 `json:"weekly_limit_usd"`
 	MonthlyLimitUSD  *float64 `json:"monthly_limit_usd"`
+	// 图片生成计费配置（antigravity 和 gemini 平台使用，负数表示清除配置）
+	ImagePrice1K *float64 `json:"image_price_1k"`
+	ImagePrice2K *float64 `json:"image_price_2k"`
+	ImagePrice4K *float64 `json:"image_price_4k"`
 }
 
 // List handles listing all groups with pagination
@@ -139,6 +147,9 @@ func (h *GroupHandler) Create(c *gin.Context) {
 		DailyLimitUSD:    req.DailyLimitUSD,
 		WeeklyLimitUSD:   req.WeeklyLimitUSD,
 		MonthlyLimitUSD:  req.MonthlyLimitUSD,
+		ImagePrice1K:     req.ImagePrice1K,
+		ImagePrice2K:     req.ImagePrice2K,
+		ImagePrice4K:     req.ImagePrice4K,
 	})
 	if err != nil {
 		response.ErrorFrom(c, err)
@@ -174,6 +185,9 @@ func (h *GroupHandler) Update(c *gin.Context) {
 		DailyLimitUSD:    req.DailyLimitUSD,
 		WeeklyLimitUSD:   req.WeeklyLimitUSD,
 		MonthlyLimitUSD:  req.MonthlyLimitUSD,
+		ImagePrice1K:     req.ImagePrice1K,
+		ImagePrice2K:     req.ImagePrice2K,
+		ImagePrice4K:     req.ImagePrice4K,
 	})
 	if err != nil {
 		response.ErrorFrom(c, err)

backend/internal/handler/admin/usage_handler.go

@@ -102,8 +102,9 @@ func (h *UsageHandler) List(c *gin.Context) {
 
 	// Parse date range
 	var startTime, endTime *time.Time
+	userTZ := c.Query("timezone") // Get user's timezone from request
 	if startDateStr := c.Query("start_date"); startDateStr != "" {
-		t, err := timezone.ParseInLocation("2006-01-02", startDateStr)
+		t, err := timezone.ParseInUserLocation("2006-01-02", startDateStr, userTZ)
 		if err != nil {
 			response.BadRequest(c, "Invalid start_date format, use YYYY-MM-DD")
 			return
@@ -112,7 +113,7 @@ func (h *UsageHandler) List(c *gin.Context) {
 	}
 
 	if endDateStr := c.Query("end_date"); endDateStr != "" {
-		t, err := timezone.ParseInLocation("2006-01-02", endDateStr)
+		t, err := timezone.ParseInUserLocation("2006-01-02", endDateStr, userTZ)
 		if err != nil {
 			response.BadRequest(c, "Invalid end_date format, use YYYY-MM-DD")
 			return
@@ -172,7 +173,8 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 	}
 
 	// Parse date range
-	now := timezone.Now()
+	userTZ := c.Query("timezone") // Get user's timezone from request
+	now := timezone.NowInUserLocation(userTZ)
 	var startTime, endTime time.Time
 
 	startDateStr := c.Query("start_date")
@@ -180,12 +182,12 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 
 	if startDateStr != "" && endDateStr != "" {
 		var err error
-		startTime, err = timezone.ParseInLocation("2006-01-02", startDateStr)
+		startTime, err = timezone.ParseInUserLocation("2006-01-02", startDateStr, userTZ)
 		if err != nil {
 			response.BadRequest(c, "Invalid start_date format, use YYYY-MM-DD")
 			return
 		}
-		endTime, err = timezone.ParseInLocation("2006-01-02", endDateStr)
+		endTime, err = timezone.ParseInUserLocation("2006-01-02", endDateStr, userTZ)
 		if err != nil {
 			response.BadRequest(c, "Invalid end_date format, use YYYY-MM-DD")
 			return
@@ -195,13 +197,13 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 		period := c.DefaultQuery("period", "today")
 		switch period {
 		case "today":
-			startTime = timezone.StartOfDay(now)
+			startTime = timezone.StartOfDayInUserLocation(now, userTZ)
 		case "week":
 			startTime = now.AddDate(0, 0, -7)
 		case "month":
 			startTime = now.AddDate(0, -1, 0)
 		default:
-			startTime = timezone.StartOfDay(now)
+			startTime = timezone.StartOfDayInUserLocation(now, userTZ)
 		}
 		endTime = now
 	}

backend/internal/handler/dto/mappers.go

@@ -78,6 +78,9 @@ func GroupFromServiceShallow(g *service.Group) *Group {
 		DailyLimitUSD:    g.DailyLimitUSD,
 		WeeklyLimitUSD:   g.WeeklyLimitUSD,
 		MonthlyLimitUSD:  g.MonthlyLimitUSD,
+		ImagePrice1K:     g.ImagePrice1K,
+		ImagePrice2K:     g.ImagePrice2K,
+		ImagePrice4K:     g.ImagePrice4K,
 		CreatedAt:        g.CreatedAt,
 		UpdatedAt:        g.UpdatedAt,
 		AccountCount:     g.AccountCount,
@@ -247,6 +250,8 @@ func UsageLogFromService(l *service.UsageLog) *UsageLog {
 		Stream:                l.Stream,
 		DurationMs:            l.DurationMs,
 		FirstTokenMs:          l.FirstTokenMs,
+		ImageCount:            l.ImageCount,
+		ImageSize:             l.ImageSize,
 		CreatedAt:             l.CreatedAt,
 		User:                  UserFromServiceShallow(l.User),
 		APIKey:                APIKeyFromService(l.APIKey),

backend/internal/handler/dto/types.go

@@ -47,6 +47,11 @@ type Group struct {
 	WeeklyLimitUSD   *float64 `json:"weekly_limit_usd"`
 	MonthlyLimitUSD  *float64 `json:"monthly_limit_usd"`
 
+	// 图片生成计费配置（仅 antigravity 平台使用）
+	ImagePrice1K *float64 `json:"image_price_1k"`
+	ImagePrice2K *float64 `json:"image_price_2k"`
+	ImagePrice4K *float64 `json:"image_price_4k"`
+
 	CreatedAt time.Time `json:"created_at"`
 	UpdatedAt time.Time `json:"updated_at"`
 
@@ -169,6 +174,10 @@ type UsageLog struct {
 	DurationMs   *int `json:"duration_ms"`
 	FirstTokenMs *int `json:"first_token_ms"`
 
+	// 图片生成字段
+	ImageCount int     `json:"image_count"`
+	ImageSize  *string `json:"image_size"`
+
 	CreatedAt time.Time `json:"created_at"`
 
 	User         *User             `json:"user,omitempty"`

backend/internal/handler/usage_handler.go

@@ -88,8 +88,9 @@ func (h *UsageHandler) List(c *gin.Context) {
 
 	// Parse date range
 	var startTime, endTime *time.Time
+	userTZ := c.Query("timezone") // Get user's timezone from request
 	if startDateStr := c.Query("start_date"); startDateStr != "" {
-		t, err := timezone.ParseInLocation("2006-01-02", startDateStr)
+		t, err := timezone.ParseInUserLocation("2006-01-02", startDateStr, userTZ)
 		if err != nil {
 			response.BadRequest(c, "Invalid start_date format, use YYYY-MM-DD")
 			return
@@ -98,7 +99,7 @@ func (h *UsageHandler) List(c *gin.Context) {
 	}
 
 	if endDateStr := c.Query("end_date"); endDateStr != "" {
-		t, err := timezone.ParseInLocation("2006-01-02", endDateStr)
+		t, err := timezone.ParseInUserLocation("2006-01-02", endDateStr, userTZ)
 		if err != nil {
 			response.BadRequest(c, "Invalid end_date format, use YYYY-MM-DD")
 			return
@@ -194,7 +195,8 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 	}
 
 	// 获取时间范围参数
-	now := timezone.Now()
+	userTZ := c.Query("timezone") // Get user's timezone from request
+	now := timezone.NowInUserLocation(userTZ)
 	var startTime, endTime time.Time
 
 	// 优先使用 start_date 和 end_date 参数
@@ -204,12 +206,12 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 	if startDateStr != "" && endDateStr != "" {
 		// 使用自定义日期范围
 		var err error
-		startTime, err = timezone.ParseInLocation("2006-01-02", startDateStr)
+		startTime, err = timezone.ParseInUserLocation("2006-01-02", startDateStr, userTZ)
 		if err != nil {
 			response.BadRequest(c, "Invalid start_date format, use YYYY-MM-DD")
 			return
 		}
-		endTime, err = timezone.ParseInLocation("2006-01-02", endDateStr)
+		endTime, err = timezone.ParseInUserLocation("2006-01-02", endDateStr, userTZ)
 		if err != nil {
 			response.BadRequest(c, "Invalid end_date format, use YYYY-MM-DD")
 			return
@@ -221,13 +223,13 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 		period := c.DefaultQuery("period", "today")
 		switch period {
 		case "today":
-			startTime = timezone.StartOfDay(now)
+			startTime = timezone.StartOfDayInUserLocation(now, userTZ)
 		case "week":
 			startTime = now.AddDate(0, 0, -7)
 		case "month":
 			startTime = now.AddDate(0, -1, 0)
 		default:
-			startTime = timezone.StartOfDay(now)
+			startTime = timezone.StartOfDayInUserLocation(now, userTZ)
 		}
 		endTime = now
 	}
@@ -248,31 +250,33 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 }
 
 // parseUserTimeRange parses start_date, end_date query parameters for user dashboard
+// Uses user's timezone if provided, otherwise falls back to server timezone
 func parseUserTimeRange(c *gin.Context) (time.Time, time.Time) {
-	now := timezone.Now()
+	userTZ := c.Query("timezone") // Get user's timezone from request
+	now := timezone.NowInUserLocation(userTZ)
 	startDate := c.Query("start_date")
 	endDate := c.Query("end_date")
 
 	var startTime, endTime time.Time
 
 	if startDate != "" {
-		if t, err := timezone.ParseInLocation("2006-01-02", startDate); err == nil {
+		if t, err := timezone.ParseInUserLocation("2006-01-02", startDate, userTZ); err == nil {
 			startTime = t
 		} else {
-			startTime = timezone.StartOfDay(now.AddDate(0, 0, -7))
+			startTime = timezone.StartOfDayInUserLocation(now.AddDate(0, 0, -7), userTZ)
 		}
 	} else {
-		startTime = timezone.StartOfDay(now.AddDate(0, 0, -7))
+		startTime = timezone.StartOfDayInUserLocation(now.AddDate(0, 0, -7), userTZ)
 	}
 
 	if endDate != "" {
-		if t, err := timezone.ParseInLocation("2006-01-02", endDate); err == nil {
+		if t, err := timezone.ParseInUserLocation("2006-01-02", endDate, userTZ); err == nil {
 			endTime = t.Add(24 * time.Hour) // Include the end date
 		} else {
-			endTime = timezone.StartOfDay(now.AddDate(0, 0, 1))
+			endTime = timezone.StartOfDayInUserLocation(now.AddDate(0, 0, 1), userTZ)
 		}
 	} else {
-		endTime = timezone.StartOfDay(now.AddDate(0, 0, 1))
+		endTime = timezone.StartOfDayInUserLocation(now.AddDate(0, 0, 1), userTZ)
 	}
 
 	return startTime, endTime

backend/internal/pkg/antigravity/gemini_types.go

@@ -67,6 +67,13 @@ type GeminiGenerationConfig struct {
 	TopK            *int                  `json:"topK,omitempty"`
 	ThinkingConfig  *GeminiThinkingConfig `json:"thinkingConfig,omitempty"`
 	StopSequences   []string              `json:"stopSequences,omitempty"`
+	ImageConfig     *GeminiImageConfig    `json:"imageConfig,omitempty"`
+}
+
+// GeminiImageConfig Gemini 图片生成配置（仅 gemini-3-pro-image 支持）
+type GeminiImageConfig struct {
+	AspectRatio string `json:"aspectRatio,omitempty"` // "1:1", "16:9", "9:16", "4:3", "3:4"
+	ImageSize   string `json:"imageSize,omitempty"`   // "1K", "2K", "4K"
 }
 
 // GeminiThinkingConfig Gemini thinking 配置

backend/internal/pkg/timezone/timezone.go

@@ -122,3 +122,40 @@ func StartOfMonth(t time.Time) time.Time {
 func ParseInLocation(layout, value string) (time.Time, error) {
 	return time.ParseInLocation(layout, value, Location())
 }
+
+// ParseInUserLocation parses a time string in the user's timezone.
+// If userTZ is empty or invalid, falls back to the configured server timezone.
+func ParseInUserLocation(layout, value, userTZ string) (time.Time, error) {
+	loc := Location() // default to server timezone
+	if userTZ != "" {
+		if userLoc, err := time.LoadLocation(userTZ); err == nil {
+			loc = userLoc
+		}
+	}
+	return time.ParseInLocation(layout, value, loc)
+}
+
+// NowInUserLocation returns the current time in the user's timezone.
+// If userTZ is empty or invalid, falls back to the configured server timezone.
+func NowInUserLocation(userTZ string) time.Time {
+	if userTZ == "" {
+		return Now()
+	}
+	if userLoc, err := time.LoadLocation(userTZ); err == nil {
+		return time.Now().In(userLoc)
+	}
+	return Now()
+}
+
+// StartOfDayInUserLocation returns the start of the given day in the user's timezone.
+// If userTZ is empty or invalid, falls back to the configured server timezone.
+func StartOfDayInUserLocation(t time.Time, userTZ string) time.Time {
+	loc := Location()
+	if userTZ != "" {
+		if userLoc, err := time.LoadLocation(userTZ); err == nil {
+			loc = userLoc
+		}
+	}
+	t = t.In(loc)
+	return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, loc)
+}

backend/internal/repository/account_repo.go

@@ -773,10 +773,15 @@ func (r *accountRepository) BulkUpdate(ctx context.Context, ids []int64, updates
 		idx++
 	}
 	if updates.ProxyID != nil {
+		// 0 表示清除代理（前端发送 0 而不是 null 来表达清除意图）
+		if *updates.ProxyID == 0 {
+			setClauses = append(setClauses, "proxy_id = NULL")
+		} else {
 			setClauses = append(setClauses, "proxy_id = $"+itoa(idx))
 			args = append(args, *updates.ProxyID)
 			idx++
 		}
+	}
 	if updates.Concurrency != nil {
 		setClauses = append(setClauses, "concurrency = $"+itoa(idx))
 		args = append(args, *updates.Concurrency)

backend/internal/repository/api_key_repo.go

@@ -321,6 +321,9 @@ func groupEntityToService(g *dbent.Group) *service.Group {
 		DailyLimitUSD:       g.DailyLimitUsd,
 		WeeklyLimitUSD:      g.WeeklyLimitUsd,
 		MonthlyLimitUSD:     g.MonthlyLimitUsd,
+		ImagePrice1K:        g.ImagePrice1k,
+		ImagePrice2K:        g.ImagePrice2k,
+		ImagePrice4K:        g.ImagePrice4k,
 		DefaultValidityDays: g.DefaultValidityDays,
 		CreatedAt:           g.CreatedAt,
 		UpdatedAt:           g.UpdatedAt,

backend/internal/repository/ent.go

@@ -56,7 +56,7 @@ func InitEnt(cfg *config.Config) (*ent.Client, *sql.DB, error) {
 	// 确保数据库 schema 已准备就绪。
 	// SQL 迁移文件是 schema 的权威来源（source of truth）。
 	// 这种方式比 Ent 的自动迁移更可控，支持复杂的迁移场景。
-	migrationCtx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
+	migrationCtx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
 	defer cancel()
 	if err := applyMigrationsFS(migrationCtx, drv.DB(), migrations.FS); err != nil {
 		_ = drv.Close() // 迁移失败时关闭驱动，避免资源泄露

backend/internal/repository/group_repo.go

@@ -43,6 +43,9 @@ func (r *groupRepository) Create(ctx context.Context, groupIn *service.Group) er
 		SetNillableDailyLimitUsd(groupIn.DailyLimitUSD).
 		SetNillableWeeklyLimitUsd(groupIn.WeeklyLimitUSD).
 		SetNillableMonthlyLimitUsd(groupIn.MonthlyLimitUSD).
+		SetNillableImagePrice1k(groupIn.ImagePrice1K).
+		SetNillableImagePrice2k(groupIn.ImagePrice2K).
+		SetNillableImagePrice4k(groupIn.ImagePrice4K).
 		SetDefaultValidityDays(groupIn.DefaultValidityDays)
 
 	created, err := builder.Save(ctx)
@@ -80,6 +83,9 @@ func (r *groupRepository) Update(ctx context.Context, groupIn *service.Group) er
 		SetNillableDailyLimitUsd(groupIn.DailyLimitUSD).
 		SetNillableWeeklyLimitUsd(groupIn.WeeklyLimitUSD).
 		SetNillableMonthlyLimitUsd(groupIn.MonthlyLimitUSD).
+		SetNillableImagePrice1k(groupIn.ImagePrice1K).
+		SetNillableImagePrice2k(groupIn.ImagePrice2K).
+		SetNillableImagePrice4k(groupIn.ImagePrice4K).
 		SetDefaultValidityDays(groupIn.DefaultValidityDays).
 		Save(ctx)
 	if err != nil {

backend/internal/repository/usage_log_repo.go

@@ -22,7 +22,7 @@ import (
 	"github.com/lib/pq"
 )
 
-const usageLogSelectColumns = "id, user_id, api_key_id, account_id, request_id, model, group_id, subscription_id, input_tokens, output_tokens, cache_creation_tokens, cache_read_tokens, cache_creation_5m_tokens, cache_creation_1h_tokens, input_cost, output_cost, cache_creation_cost, cache_read_cost, total_cost, actual_cost, rate_multiplier, billing_type, stream, duration_ms, first_token_ms, created_at"
+const usageLogSelectColumns = "id, user_id, api_key_id, account_id, request_id, model, group_id, subscription_id, input_tokens, output_tokens, cache_creation_tokens, cache_read_tokens, cache_creation_5m_tokens, cache_creation_1h_tokens, input_cost, output_cost, cache_creation_cost, cache_read_cost, total_cost, actual_cost, rate_multiplier, billing_type, stream, duration_ms, first_token_ms, image_count, image_size, created_at"
 
 type usageLogRepository struct {
 	client *dbent.Client
@@ -109,6 +109,8 @@ func (r *usageLogRepository) Create(ctx context.Context, log *service.UsageLog)
 			stream,
 			duration_ms,
 			first_token_ms,
+			image_count,
+			image_size,
 			created_at
 		) VALUES (
 			$1, $2, $3, $4, $5,
@@ -116,7 +118,8 @@ func (r *usageLogRepository) Create(ctx context.Context, log *service.UsageLog)
 			$8, $9, $10, $11,
 			$12, $13,
 			$14, $15, $16, $17, $18, $19,
-			$20, $21, $22, $23, $24, $25
+			$20, $21, $22, $23, $24,
+			$25, $26, $27
 		)
 		ON CONFLICT (request_id, api_key_id) DO NOTHING
 		RETURNING id, created_at
@@ -126,6 +129,7 @@ func (r *usageLogRepository) Create(ctx context.Context, log *service.UsageLog)
 	subscriptionID := nullInt64(log.SubscriptionID)
 	duration := nullInt(log.DurationMs)
 	firstToken := nullInt(log.FirstTokenMs)
+	imageSize := nullString(log.ImageSize)
 
 	var requestIDArg any
 	if requestID != "" {
@@ -157,6 +161,8 @@ func (r *usageLogRepository) Create(ctx context.Context, log *service.UsageLog)
 		log.Stream,
 		duration,
 		firstToken,
+		log.ImageCount,
+		imageSize,
 		createdAt,
 	}
 	if err := scanSingleRow(ctx, sqlq, query, args, &log.ID, &log.CreatedAt); err != nil {
@@ -1789,6 +1795,8 @@ func scanUsageLog(scanner interface{ Scan(...any) error }) (*service.UsageLog, e
 		stream              bool
 		durationMs          sql.NullInt64
 		firstTokenMs        sql.NullInt64
+		imageCount          int
+		imageSize           sql.NullString
 		createdAt           time.Time
 	)
 
@@ -1818,6 +1826,8 @@ func scanUsageLog(scanner interface{ Scan(...any) error }) (*service.UsageLog, e
 		&stream,
 		&durationMs,
 		&firstTokenMs,
+		&imageCount,
+		&imageSize,
 		&createdAt,
 	); err != nil {
 		return nil, err
@@ -1844,6 +1854,7 @@ func scanUsageLog(scanner interface{ Scan(...any) error }) (*service.UsageLog, e
 		RateMultiplier:        rateMultiplier,
 		BillingType:           int8(billingType),
 		Stream:                stream,
+		ImageCount:            imageCount,
 		CreatedAt:             createdAt,
 	}
 
@@ -1866,6 +1877,9 @@ func scanUsageLog(scanner interface{ Scan(...any) error }) (*service.UsageLog, e
 		value := int(firstTokenMs.Int64)
 		log.FirstTokenMs = &value
 	}
+	if imageSize.Valid {
+		log.ImageSize = &imageSize.String
+	}
 
 	return log, nil
 }
@@ -1938,6 +1952,13 @@ func nullInt(v *int) sql.NullInt64 {
 	return sql.NullInt64{Int64: int64(*v), Valid: true}
 }
 
+func nullString(v *string) sql.NullString {
+	if v == nil || *v == "" {
+		return sql.NullString{}
+	}
+	return sql.NullString{String: *v, Valid: true}
+}
+
 func setToSlice(set map[int64]struct{}) []int64 {
 	out := make([]int64, 0, len(set))
 	for id := range set {

backend/internal/repository/user_repo.go

@@ -329,17 +329,20 @@ func (r *userRepository) UpdateBalance(ctx context.Context, id int64, amount flo
 	return nil
 }
 
+// DeductBalance 扣除用户余额
+// 透支策略：允许余额变为负数，确保当前请求能够完成
+// 中间件会阻止余额 <= 0 的用户发起后续请求
 func (r *userRepository) DeductBalance(ctx context.Context, id int64, amount float64) error {
 	client := clientFromContext(ctx, r.client)
 	n, err := client.User.Update().
-		Where(dbuser.IDEQ(id), dbuser.BalanceGTE(amount)).
+		Where(dbuser.IDEQ(id)).
 		AddBalance(-amount).
 		Save(ctx)
 	if err != nil {
 		return err
 	}
 	if n == 0 {
-		return service.ErrInsufficientBalance
+		return service.ErrUserNotFound
 	}
 	return nil
 }

backend/internal/repository/user_repo_integration_test.go

@@ -290,9 +290,14 @@ func (s *UserRepoSuite) TestDeductBalance() {
 func (s *UserRepoSuite) TestDeductBalance_InsufficientFunds() {
 	user := s.mustCreateUser(&service.User{Email: "insuf@test.com", Balance: 5})
 
+	// 透支策略：允许扣除超过余额的金额
 	err := s.repo.DeductBalance(s.ctx, user.ID, 999)
-	s.Require().Error(err, "expected error for insufficient balance")
-	s.Require().ErrorIs(err, service.ErrInsufficientBalance)
+	s.Require().NoError(err, "DeductBalance should allow overdraft")
+
+	// 验证余额变为负数
+	got, err := s.repo.GetByID(s.ctx, user.ID)
+	s.Require().NoError(err)
+	s.Require().InDelta(-994.0, got.Balance, 1e-6, "Balance should be negative after overdraft")
 }
 
 func (s *UserRepoSuite) TestDeductBalance_ExactAmount() {
@@ -306,6 +311,19 @@ func (s *UserRepoSuite) TestDeductBalance_ExactAmount() {
 	s.Require().InDelta(0.0, got.Balance, 1e-6)
 }
 
+func (s *UserRepoSuite) TestDeductBalance_AllowsOverdraft() {
+	user := s.mustCreateUser(&service.User{Email: "overdraft@test.com", Balance: 5.0})
+
+	// 扣除超过余额的金额 - 应该成功
+	err := s.repo.DeductBalance(s.ctx, user.ID, 10.0)
+	s.Require().NoError(err, "DeductBalance should allow overdraft")
+
+	// 验证余额为负
+	got, err := s.repo.GetByID(s.ctx, user.ID)
+	s.Require().NoError(err)
+	s.Require().InDelta(-5.0, got.Balance, 1e-6, "Balance should be -5.0 after overdraft")
+}
+
 // --- Concurrency ---
 
 func (s *UserRepoSuite) TestUpdateConcurrency() {
@@ -477,9 +495,12 @@ func (s *UserRepoSuite) TestCRUD_And_Filters_And_AtomicUpdates() {
 	s.Require().NoError(err, "GetByID after DeductBalance")
 	s.Require().InDelta(7.5, got4.Balance, 1e-6)
 
+	// 透支策略：允许扣除超过余额的金额
 	err = s.repo.DeductBalance(s.ctx, user1.ID, 999)
-	s.Require().Error(err, "DeductBalance expected error for insufficient balance")
-	s.Require().ErrorIs(err, service.ErrInsufficientBalance, "DeductBalance unexpected error")
+	s.Require().NoError(err, "DeductBalance should allow overdraft")
+	gotOverdraft, err := s.repo.GetByID(s.ctx, user1.ID)
+	s.Require().NoError(err, "GetByID after overdraft")
+	s.Require().Less(gotOverdraft.Balance, 0.0, "Balance should be negative after overdraft")
 
 	s.Require().NoError(s.repo.UpdateConcurrency(s.ctx, user1.ID, 3), "UpdateConcurrency")
 	got5, err := s.repo.GetByID(s.ctx, user1.ID)
@@ -511,6 +532,6 @@ func (s *UserRepoSuite) TestUpdateConcurrency_NotFound() {
 func (s *UserRepoSuite) TestDeductBalance_NotFound() {
 	err := s.repo.DeductBalance(s.ctx, 999999, 5)
 	s.Require().Error(err, "expected error for non-existent user")
-	// DeductBalance 在用户不存在时返回 ErrInsufficientBalance 因为 WHERE 条件不匹配
-	s.Require().ErrorIs(err, service.ErrInsufficientBalance)
+	// DeductBalance 在用户不存在时返回 ErrUserNotFound
+	s.Require().ErrorIs(err, service.ErrUserNotFound)
 }

backend/internal/server/api_contract_test.go

@@ -241,6 +241,8 @@ func TestAPIContracts(t *testing.T) {
 							"stream": true,
 							"duration_ms": 100,
 							"first_token_ms": 50,
+							"image_count": 0,
+							"image_size": null,
 							"created_at": "2025-01-02T03:04:05Z"
 						}
 					],

backend/internal/service/admin_service.go

@@ -98,6 +98,10 @@ type CreateGroupInput struct {
 	DailyLimitUSD    *float64 // 日限额 (USD)
 	WeeklyLimitUSD   *float64 // 周限额 (USD)
 	MonthlyLimitUSD  *float64 // 月限额 (USD)
+	// 图片生成计费配置（仅 antigravity 平台使用）
+	ImagePrice1K *float64
+	ImagePrice2K *float64
+	ImagePrice4K *float64
 }
 
 type UpdateGroupInput struct {
@@ -111,6 +115,10 @@ type UpdateGroupInput struct {
 	DailyLimitUSD    *float64 // 日限额 (USD)
 	WeeklyLimitUSD   *float64 // 周限额 (USD)
 	MonthlyLimitUSD  *float64 // 月限额 (USD)
+	// 图片生成计费配置（仅 antigravity 平台使用）
+	ImagePrice1K *float64
+	ImagePrice2K *float64
+	ImagePrice4K *float64
 }
 
 type CreateAccountInput struct {
@@ -498,6 +506,11 @@ func (s *adminServiceImpl) CreateGroup(ctx context.Context, input *CreateGroupIn
 	weeklyLimit := normalizeLimit(input.WeeklyLimitUSD)
 	monthlyLimit := normalizeLimit(input.MonthlyLimitUSD)
 
+	// 图片价格：负数表示清除（使用默认价格），0 保留（表示免费）
+	imagePrice1K := normalizePrice(input.ImagePrice1K)
+	imagePrice2K := normalizePrice(input.ImagePrice2K)
+	imagePrice4K := normalizePrice(input.ImagePrice4K)
+
 	group := &Group{
 		Name:             input.Name,
 		Description:      input.Description,
@@ -509,6 +522,9 @@ func (s *adminServiceImpl) CreateGroup(ctx context.Context, input *CreateGroupIn
 		DailyLimitUSD:    dailyLimit,
 		WeeklyLimitUSD:   weeklyLimit,
 		MonthlyLimitUSD:  monthlyLimit,
+		ImagePrice1K:     imagePrice1K,
+		ImagePrice2K:     imagePrice2K,
+		ImagePrice4K:     imagePrice4K,
 	}
 	if err := s.groupRepo.Create(ctx, group); err != nil {
 		return nil, err
@@ -524,6 +540,14 @@ func normalizeLimit(limit *float64) *float64 {
 	return limit
 }
 
+// normalizePrice 将负数转换为 nil（表示使用默认价格），0 保留（表示免费）
+func normalizePrice(price *float64) *float64 {
+	if price == nil || *price < 0 {
+		return nil
+	}
+	return price
+}
+
 func (s *adminServiceImpl) UpdateGroup(ctx context.Context, id int64, input *UpdateGroupInput) (*Group, error) {
 	group, err := s.groupRepo.GetByID(ctx, id)
 	if err != nil {
@@ -563,6 +587,16 @@ func (s *adminServiceImpl) UpdateGroup(ctx context.Context, id int64, input *Upd
 	if input.MonthlyLimitUSD != nil {
 		group.MonthlyLimitUSD = normalizeLimit(input.MonthlyLimitUSD)
 	}
+	// 图片生成计费配置：负数表示清除（使用默认价格）
+	if input.ImagePrice1K != nil {
+		group.ImagePrice1K = normalizePrice(input.ImagePrice1K)
+	}
+	if input.ImagePrice2K != nil {
+		group.ImagePrice2K = normalizePrice(input.ImagePrice2K)
+	}
+	if input.ImagePrice4K != nil {
+		group.ImagePrice4K = normalizePrice(input.ImagePrice4K)
+	}
 
 	if err := s.groupRepo.Update(ctx, group); err != nil {
 		return nil, err
@@ -702,7 +736,12 @@ func (s *adminServiceImpl) UpdateAccount(ctx context.Context, id int64, input *U
 		account.Extra = input.Extra
 	}
 	if input.ProxyID != nil {
+		// 0 表示清除代理（前端发送 0 而不是 null 来表达清除意图）
+		if *input.ProxyID == 0 {
+			account.ProxyID = nil
+		} else {
 			account.ProxyID = input.ProxyID
+		}
 		account.Proxy = nil // 清除关联对象，防止 GORM Save 时根据 Proxy.ID 覆盖 ProxyID
 	}
 	// 只在指针非 nil 时更新 Concurrency（支持设置为 0）

backend/internal/service/admin_service_group_test.go

+//go:build unit
+
+package service
+
+import (
+	"context"
+	"testing"
+
+	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/stretchr/testify/require"
+)
+
+// groupRepoStubForAdmin 用于测试 AdminService 的 GroupRepository Stub
+type groupRepoStubForAdmin struct {
+	created *Group // 记录 Create 调用的参数
+	updated *Group // 记录 Update 调用的参数
+	getByID *Group // GetByID 返回值
+	getErr  error  // GetByID 返回的错误
+}
+
+func (s *groupRepoStubForAdmin) Create(_ context.Context, g *Group) error {
+	s.created = g
+	return nil
+}
+
+func (s *groupRepoStubForAdmin) Update(_ context.Context, g *Group) error {
+	s.updated = g
+	return nil
+}
+
+func (s *groupRepoStubForAdmin) GetByID(_ context.Context, _ int64) (*Group, error) {
+	if s.getErr != nil {
+		return nil, s.getErr
+	}
+	return s.getByID, nil
+}
+
+func (s *groupRepoStubForAdmin) Delete(_ context.Context, _ int64) error {
+	panic("unexpected Delete call")
+}
+
+func (s *groupRepoStubForAdmin) DeleteCascade(_ context.Context, _ int64) ([]int64, error) {
+	panic("unexpected DeleteCascade call")
+}
+
+func (s *groupRepoStubForAdmin) List(_ context.Context, _ pagination.PaginationParams) ([]Group, *pagination.PaginationResult, error) {
+	panic("unexpected List call")
+}
+
+func (s *groupRepoStubForAdmin) ListWithFilters(_ context.Context, _ pagination.PaginationParams, _, _ string, _ *bool) ([]Group, *pagination.PaginationResult, error) {
+	panic("unexpected ListWithFilters call")
+}
+
+func (s *groupRepoStubForAdmin) ListActive(_ context.Context) ([]Group, error) {
+	panic("unexpected ListActive call")
+}
+
+func (s *groupRepoStubForAdmin) ListActiveByPlatform(_ context.Context, _ string) ([]Group, error) {
+	panic("unexpected ListActiveByPlatform call")
+}
+
+func (s *groupRepoStubForAdmin) ExistsByName(_ context.Context, _ string) (bool, error) {
+	panic("unexpected ExistsByName call")
+}
+
+func (s *groupRepoStubForAdmin) GetAccountCount(_ context.Context, _ int64) (int64, error) {
+	panic("unexpected GetAccountCount call")
+}
+
+func (s *groupRepoStubForAdmin) DeleteAccountGroupsByGroupID(_ context.Context, _ int64) (int64, error) {
+	panic("unexpected DeleteAccountGroupsByGroupID call")
+}
+
+// TestAdminService_CreateGroup_WithImagePricing 测试创建分组时 ImagePrice 字段正确传递
+func TestAdminService_CreateGroup_WithImagePricing(t *testing.T) {
+	repo := &groupRepoStubForAdmin{}
+	svc := &adminServiceImpl{groupRepo: repo}
+
+	price1K := 0.10
+	price2K := 0.15
+	price4K := 0.30
+
+	input := &CreateGroupInput{
+		Name:           "test-group",
+		Description:    "Test group",
+		Platform:       PlatformAntigravity,
+		RateMultiplier: 1.0,
+		ImagePrice1K:   &price1K,
+		ImagePrice2K:   &price2K,
+		ImagePrice4K:   &price4K,
+	}
+
+	group, err := svc.CreateGroup(context.Background(), input)
+	require.NoError(t, err)
+	require.NotNil(t, group)
+
+	// 验证 repo 收到了正确的字段
+	require.NotNil(t, repo.created)
+	require.NotNil(t, repo.created.ImagePrice1K)
+	require.NotNil(t, repo.created.ImagePrice2K)
+	require.NotNil(t, repo.created.ImagePrice4K)
+	require.InDelta(t, 0.10, *repo.created.ImagePrice1K, 0.0001)
+	require.InDelta(t, 0.15, *repo.created.ImagePrice2K, 0.0001)
+	require.InDelta(t, 0.30, *repo.created.ImagePrice4K, 0.0001)
+}
+
+// TestAdminService_CreateGroup_NilImagePricing 测试 ImagePrice 为 nil 时正常创建
+func TestAdminService_CreateGroup_NilImagePricing(t *testing.T) {
+	repo := &groupRepoStubForAdmin{}
+	svc := &adminServiceImpl{groupRepo: repo}
+
+	input := &CreateGroupInput{
+		Name:           "test-group",
+		Description:    "Test group",
+		Platform:       PlatformAntigravity,
+		RateMultiplier: 1.0,
+		// ImagePrice 字段全部为 nil
+	}
+
+	group, err := svc.CreateGroup(context.Background(), input)
+	require.NoError(t, err)
+	require.NotNil(t, group)
+
+	// 验证 ImagePrice 字段为 nil
+	require.NotNil(t, repo.created)
+	require.Nil(t, repo.created.ImagePrice1K)
+	require.Nil(t, repo.created.ImagePrice2K)
+	require.Nil(t, repo.created.ImagePrice4K)
+}
+
+// TestAdminService_UpdateGroup_WithImagePricing 测试更新分组时 ImagePrice 字段正确更新
+func TestAdminService_UpdateGroup_WithImagePricing(t *testing.T) {
+	existingGroup := &Group{
+		ID:       1,
+		Name:     "existing-group",
+		Platform: PlatformAntigravity,
+		Status:   StatusActive,
+	}
+	repo := &groupRepoStubForAdmin{getByID: existingGroup}
+	svc := &adminServiceImpl{groupRepo: repo}
+
+	price1K := 0.12
+	price2K := 0.18
+	price4K := 0.36
+
+	input := &UpdateGroupInput{
+		ImagePrice1K: &price1K,
+		ImagePrice2K: &price2K,
+		ImagePrice4K: &price4K,
+	}
+
+	group, err := svc.UpdateGroup(context.Background(), 1, input)
+	require.NoError(t, err)
+	require.NotNil(t, group)
+
+	// 验证 repo 收到了更新后的字段
+	require.NotNil(t, repo.updated)
+	require.NotNil(t, repo.updated.ImagePrice1K)
+	require.NotNil(t, repo.updated.ImagePrice2K)
+	require.NotNil(t, repo.updated.ImagePrice4K)
+	require.InDelta(t, 0.12, *repo.updated.ImagePrice1K, 0.0001)
+	require.InDelta(t, 0.18, *repo.updated.ImagePrice2K, 0.0001)
+	require.InDelta(t, 0.36, *repo.updated.ImagePrice4K, 0.0001)
+}
+
+// TestAdminService_UpdateGroup_PartialImagePricing 测试仅更新部分 ImagePrice 字段
+func TestAdminService_UpdateGroup_PartialImagePricing(t *testing.T) {
+	oldPrice2K := 0.15
+	existingGroup := &Group{
+		ID:           1,
+		Name:         "existing-group",
+		Platform:     PlatformAntigravity,
+		Status:       StatusActive,
+		ImagePrice2K: &oldPrice2K, // 已有 2K 价格
+	}
+	repo := &groupRepoStubForAdmin{getByID: existingGroup}
+	svc := &adminServiceImpl{groupRepo: repo}
+
+	// 只更新 1K 价格
+	price1K := 0.10
+	input := &UpdateGroupInput{
+		ImagePrice1K: &price1K,
+		// ImagePrice2K 和 ImagePrice4K 为 nil，不更新
+	}
+
+	group, err := svc.UpdateGroup(context.Background(), 1, input)
+	require.NoError(t, err)
+	require.NotNil(t, group)
+
+	// 验证：1K 被更新，2K 保持原值，4K 仍为 nil
+	require.NotNil(t, repo.updated)
+	require.NotNil(t, repo.updated.ImagePrice1K)
+	require.InDelta(t, 0.10, *repo.updated.ImagePrice1K, 0.0001)
+	require.NotNil(t, repo.updated.ImagePrice2K)
+	require.InDelta(t, 0.15, *repo.updated.ImagePrice2K, 0.0001) // 原值保持
+	require.Nil(t, repo.updated.ImagePrice4K)
+}

backend/internal/service/antigravity_gateway_service.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"io"
 	"log"
+	mathrand "math/rand"
 	"net/http"
 	"strings"
 	"sync/atomic"
@@ -405,6 +406,14 @@ func (s *AntigravityGatewayService) Forward(ctx context.Context, c *gin.Context,
 	// 重试循环
 	var resp *http.Response
 	for attempt := 1; attempt <= antigravityMaxRetries; attempt++ {
+		// 检查 context 是否已取消（客户端断开连接）
+		select {
+		case <-ctx.Done():
+			log.Printf("%s status=context_canceled error=%v", prefix, ctx.Err())
+			return nil, ctx.Err()
+		default:
+		}
+
 		upstreamReq, err := antigravity.NewAPIRequest(ctx, action, accessToken, geminiBody)
 		if err != nil {
 			return nil, err
@@ -414,7 +423,10 @@ func (s *AntigravityGatewayService) Forward(ctx context.Context, c *gin.Context,
 		if err != nil {
 			if attempt < antigravityMaxRetries {
 				log.Printf("%s status=request_failed retry=%d/%d error=%v", prefix, attempt, antigravityMaxRetries, err)
-				sleepAntigravityBackoff(attempt)
+				if !sleepAntigravityBackoffWithContext(ctx, attempt) {
+					log.Printf("%s status=context_canceled_during_backoff", prefix)
+					return nil, ctx.Err()
+				}
 				continue
 			}
 			log.Printf("%s status=request_failed retries_exhausted error=%v", prefix, err)
@@ -427,7 +439,10 @@ func (s *AntigravityGatewayService) Forward(ctx context.Context, c *gin.Context,
 
 			if attempt < antigravityMaxRetries {
 				log.Printf("%s status=%d retry=%d/%d", prefix, resp.StatusCode, attempt, antigravityMaxRetries)
-				sleepAntigravityBackoff(attempt)
+				if !sleepAntigravityBackoffWithContext(ctx, attempt) {
+					log.Printf("%s status=context_canceled_during_backoff", prefix)
+					return nil, ctx.Err()
+				}
 				continue
 			}
 			// 所有重试都失败，标记限流状态
@@ -845,6 +860,9 @@ func (s *AntigravityGatewayService) ForwardGemini(ctx context.Context, c *gin.Co
 		return nil, s.writeGoogleError(c, http.StatusBadRequest, "Request body is empty")
 	}
 
+	// 解析请求以获取 image_size（用于图片计费）
+	imageSize := s.extractImageSize(body)
+
 	switch action {
 	case "generateContent", "streamGenerateContent":
 		// ok
@@ -901,6 +919,14 @@ func (s *AntigravityGatewayService) ForwardGemini(ctx context.Context, c *gin.Co
 	// 重试循环
 	var resp *http.Response
 	for attempt := 1; attempt <= antigravityMaxRetries; attempt++ {
+		// 检查 context 是否已取消（客户端断开连接）
+		select {
+		case <-ctx.Done():
+			log.Printf("%s status=context_canceled error=%v", prefix, ctx.Err())
+			return nil, ctx.Err()
+		default:
+		}
+
 		upstreamReq, err := antigravity.NewAPIRequest(ctx, upstreamAction, accessToken, wrappedBody)
 		if err != nil {
 			return nil, err
@@ -910,7 +936,10 @@ func (s *AntigravityGatewayService) ForwardGemini(ctx context.Context, c *gin.Co
 		if err != nil {
 			if attempt < antigravityMaxRetries {
 				log.Printf("%s status=request_failed retry=%d/%d error=%v", prefix, attempt, antigravityMaxRetries, err)
-				sleepAntigravityBackoff(attempt)
+				if !sleepAntigravityBackoffWithContext(ctx, attempt) {
+					log.Printf("%s status=context_canceled_during_backoff", prefix)
+					return nil, ctx.Err()
+				}
 				continue
 			}
 			log.Printf("%s status=request_failed retries_exhausted error=%v", prefix, err)
@@ -923,7 +952,10 @@ func (s *AntigravityGatewayService) ForwardGemini(ctx context.Context, c *gin.Co
 
 			if attempt < antigravityMaxRetries {
 				log.Printf("%s status=%d retry=%d/%d", prefix, resp.StatusCode, attempt, antigravityMaxRetries)
-				sleepAntigravityBackoff(attempt)
+				if !sleepAntigravityBackoffWithContext(ctx, attempt) {
+					log.Printf("%s status=context_canceled_during_backoff", prefix)
+					return nil, ctx.Err()
+				}
 				continue
 			}
 			// 所有重试都失败，标记限流状态
@@ -1030,6 +1062,13 @@ handleSuccess:
 		usage = &ClaudeUsage{}
 	}
 
+	// 判断是否为图片生成模型
+	imageCount := 0
+	if isImageGenerationModel(mappedModel) {
+		// Gemini 图片生成 API 每次请求只生成一张图片（API 限制）
+		imageCount = 1
+	}
+
 	return &ForwardResult{
 		RequestID:    requestID,
 		Usage:        *usage,
@@ -1037,6 +1076,8 @@ handleSuccess:
 		Stream:       stream,
 		Duration:     time.Since(startTime),
 		FirstTokenMs: firstTokenMs,
+		ImageCount:   imageCount,
+		ImageSize:    imageSize,
 	}, nil
 }
 
@@ -1058,8 +1099,28 @@ func (s *AntigravityGatewayService) shouldFailoverUpstreamError(statusCode int)
 	}
 }
 
-func sleepAntigravityBackoff(attempt int) {
-	sleepGeminiBackoff(attempt) // 复用 Gemini 的退避逻辑
+// sleepAntigravityBackoffWithContext 带 context 取消检查的退避等待
+// 返回 true 表示正常完成等待，false 表示 context 已取消
+func sleepAntigravityBackoffWithContext(ctx context.Context, attempt int) bool {
+	delay := geminiRetryBaseDelay * time.Duration(1<<uint(attempt-1))
+	if delay > geminiRetryMaxDelay {
+		delay = geminiRetryMaxDelay
+	}
+
+	// +/- 20% jitter
+	r := mathrand.New(mathrand.NewSource(time.Now().UnixNano()))
+	jitter := time.Duration(float64(delay) * 0.2 * (r.Float64()*2 - 1))
+	sleepFor := delay + jitter
+	if sleepFor < 0 {
+		sleepFor = 0
+	}
+
+	select {
+	case <-ctx.Done():
+		return false
+	case <-time.After(sleepFor):
+		return true
+	}
 }
 
 func (s *AntigravityGatewayService) handleUpstreamError(ctx context.Context, prefix string, account *Account, statusCode int, headers http.Header, body []byte) {
@@ -1523,3 +1584,36 @@ func (s *AntigravityGatewayService) handleClaudeStreamingResponse(c *gin.Context
 	}
 
 }
+
+// extractImageSize 从 Gemini 请求中提取 image_size 参数
+func (s *AntigravityGatewayService) extractImageSize(body []byte) string {
+	var req antigravity.GeminiRequest
+	if err := json.Unmarshal(body, &req); err != nil {
+		return "2K" // 默认 2K
+	}
+
+	if req.GenerationConfig != nil && req.GenerationConfig.ImageConfig != nil {
+		size := strings.ToUpper(strings.TrimSpace(req.GenerationConfig.ImageConfig.ImageSize))
+		if size == "1K" || size == "2K" || size == "4K" {
+			return size
+		}
+	}
+
+	return "2K" // 默认 2K
+}
+
+// isImageGenerationModel 判断模型是否为图片生成模型
+// 支持的模型：gemini-3-pro-image, gemini-3-pro-image-preview, gemini-2.5-flash-image 等
+func isImageGenerationModel(model string) bool {
+	modelLower := strings.ToLower(model)
+	// 移除 models/ 前缀
+	modelLower = strings.TrimPrefix(modelLower, "models/")
+
+	// 精确匹配或前缀匹配
+	return modelLower == "gemini-3-pro-image" ||
+		modelLower == "gemini-3-pro-image-preview" ||
+		strings.HasPrefix(modelLower, "gemini-3-pro-image-") ||
+		modelLower == "gemini-2.5-flash-image" ||
+		modelLower == "gemini-2.5-flash-image-preview" ||
+		strings.HasPrefix(modelLower, "gemini-2.5-flash-image-")
+}

backend/internal/service/antigravity_image_test.go

+//go:build unit
+
+package service
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestIsImageGenerationModel_GeminiProImage 测试 gemini-3-pro-image 识别
+func TestIsImageGenerationModel_GeminiProImage(t *testing.T) {
+	require.True(t, isImageGenerationModel("gemini-3-pro-image"))
+	require.True(t, isImageGenerationModel("gemini-3-pro-image-preview"))
+	require.True(t, isImageGenerationModel("models/gemini-3-pro-image"))
+}
+
+// TestIsImageGenerationModel_GeminiFlashImage 测试 gemini-2.5-flash-image 识别
+func TestIsImageGenerationModel_GeminiFlashImage(t *testing.T) {
+	require.True(t, isImageGenerationModel("gemini-2.5-flash-image"))
+	require.True(t, isImageGenerationModel("gemini-2.5-flash-image-preview"))
+}
+
+// TestIsImageGenerationModel_RegularModel 测试普通模型不被识别为图片模型
+func TestIsImageGenerationModel_RegularModel(t *testing.T) {
+	require.False(t, isImageGenerationModel("claude-3-opus"))
+	require.False(t, isImageGenerationModel("claude-sonnet-4-20250514"))
+	require.False(t, isImageGenerationModel("gpt-4o"))
+	require.False(t, isImageGenerationModel("gemini-2.5-pro")) // 非图片模型
+	require.False(t, isImageGenerationModel("gemini-2.5-flash"))
+	// 验证不会误匹配包含关键词的自定义模型名
+	require.False(t, isImageGenerationModel("my-gemini-3-pro-image-test"))
+	require.False(t, isImageGenerationModel("custom-gemini-2.5-flash-image-wrapper"))
+}
+
+// TestIsImageGenerationModel_CaseInsensitive 测试大小写不敏感
+func TestIsImageGenerationModel_CaseInsensitive(t *testing.T) {
+	require.True(t, isImageGenerationModel("GEMINI-3-PRO-IMAGE"))
+	require.True(t, isImageGenerationModel("Gemini-3-Pro-Image"))
+	require.True(t, isImageGenerationModel("GEMINI-2.5-FLASH-IMAGE"))
+}
+
+// TestExtractImageSize_ValidSizes 测试有效尺寸解析
+func TestExtractImageSize_ValidSizes(t *testing.T) {
+	svc := &AntigravityGatewayService{}
+
+	// 1K
+	body := []byte(`{"generationConfig":{"imageConfig":{"imageSize":"1K"}}}`)
+	require.Equal(t, "1K", svc.extractImageSize(body))
+
+	// 2K
+	body = []byte(`{"generationConfig":{"imageConfig":{"imageSize":"2K"}}}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+
+	// 4K
+	body = []byte(`{"generationConfig":{"imageConfig":{"imageSize":"4K"}}}`)
+	require.Equal(t, "4K", svc.extractImageSize(body))
+}
+
+// TestExtractImageSize_CaseInsensitive 测试大小写不敏感
+func TestExtractImageSize_CaseInsensitive(t *testing.T) {
+	svc := &AntigravityGatewayService{}
+
+	body := []byte(`{"generationConfig":{"imageConfig":{"imageSize":"1k"}}}`)
+	require.Equal(t, "1K", svc.extractImageSize(body))
+
+	body = []byte(`{"generationConfig":{"imageConfig":{"imageSize":"4k"}}}`)
+	require.Equal(t, "4K", svc.extractImageSize(body))
+}
+
+// TestExtractImageSize_Default 测试无 imageConfig 返回默认 2K
+func TestExtractImageSize_Default(t *testing.T) {
+	svc := &AntigravityGatewayService{}
+
+	// 无 generationConfig
+	body := []byte(`{"contents":[]}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+
+	// 有 generationConfig 但无 imageConfig
+	body = []byte(`{"generationConfig":{"temperature":0.7}}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+
+	// 有 imageConfig 但无 imageSize
+	body = []byte(`{"generationConfig":{"imageConfig":{}}}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+}
+
+// TestExtractImageSize_InvalidJSON 测试非法 JSON 返回默认 2K
+func TestExtractImageSize_InvalidJSON(t *testing.T) {
+	svc := &AntigravityGatewayService{}
+
+	body := []byte(`not valid json`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+
+	body = []byte(`{"broken":`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+}
+
+// TestExtractImageSize_EmptySize 测试空 imageSize 返回默认 2K
+func TestExtractImageSize_EmptySize(t *testing.T) {
+	svc := &AntigravityGatewayService{}
+
+	body := []byte(`{"generationConfig":{"imageConfig":{"imageSize":""}}}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+
+	// 空格
+	body = []byte(`{"generationConfig":{"imageConfig":{"imageSize":"   "}}}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+}
+
+// TestExtractImageSize_InvalidSize 测试无效尺寸返回默认 2K
+func TestExtractImageSize_InvalidSize(t *testing.T) {
+	svc := &AntigravityGatewayService{}
+
+	body := []byte(`{"generationConfig":{"imageConfig":{"imageSize":"3K"}}}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+
+	body = []byte(`{"generationConfig":{"imageConfig":{"imageSize":"8K"}}}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+
+	body = []byte(`{"generationConfig":{"imageConfig":{"imageSize":"invalid"}}}`)
+	require.Equal(t, "2K", svc.extractImageSize(body))
+}

backend/internal/service/billing_service.go

@@ -295,3 +295,88 @@ func (s *BillingService) ForceUpdatePricing() error {
 	}
 	return fmt.Errorf("pricing service not initialized")
 }
+
+// ImagePriceConfig 图片计费配置
+type ImagePriceConfig struct {
+	Price1K *float64 // 1K 尺寸价格（nil 表示使用默认值）
+	Price2K *float64 // 2K 尺寸价格（nil 表示使用默认值）
+	Price4K *float64 // 4K 尺寸价格（nil 表示使用默认值）
+}
+
+// CalculateImageCost 计算图片生成费用
+// model: 请求的模型名称（用于获取 LiteLLM 默认价格）
+// imageSize: 图片尺寸 "1K", "2K", "4K"
+// imageCount: 生成的图片数量
+// groupConfig: 分组配置的价格（可能为 nil，表示使用默认值）
+// rateMultiplier: 费率倍数
+func (s *BillingService) CalculateImageCost(model string, imageSize string, imageCount int, groupConfig *ImagePriceConfig, rateMultiplier float64) *CostBreakdown {
+	if imageCount <= 0 {
+		return &CostBreakdown{}
+	}
+
+	// 获取单价
+	unitPrice := s.getImageUnitPrice(model, imageSize, groupConfig)
+
+	// 计算总费用
+	totalCost := unitPrice * float64(imageCount)
+
+	// 应用倍率
+	if rateMultiplier <= 0 {
+		rateMultiplier = 1.0
+	}
+	actualCost := totalCost * rateMultiplier
+
+	return &CostBreakdown{
+		TotalCost:  totalCost,
+		ActualCost: actualCost,
+	}
+}
+
+// getImageUnitPrice 获取图片单价
+func (s *BillingService) getImageUnitPrice(model string, imageSize string, groupConfig *ImagePriceConfig) float64 {
+	// 优先使用分组配置的价格
+	if groupConfig != nil {
+		switch imageSize {
+		case "1K":
+			if groupConfig.Price1K != nil {
+				return *groupConfig.Price1K
+			}
+		case "2K":
+			if groupConfig.Price2K != nil {
+				return *groupConfig.Price2K
+			}
+		case "4K":
+			if groupConfig.Price4K != nil {
+				return *groupConfig.Price4K
+			}
+		}
+	}
+
+	// 回退到 LiteLLM 默认价格
+	return s.getDefaultImagePrice(model, imageSize)
+}
+
+// getDefaultImagePrice 获取 LiteLLM 默认图片价格
+func (s *BillingService) getDefaultImagePrice(model string, imageSize string) float64 {
+	basePrice := 0.0
+
+	// 从 PricingService 获取 output_cost_per_image
+	if s.pricingService != nil {
+		pricing := s.pricingService.GetModelPricing(model)
+		if pricing != nil && pricing.OutputCostPerImage > 0 {
+			basePrice = pricing.OutputCostPerImage
+		}
+	}
+
+	// 如果没有找到价格，使用硬编码默认值（$0.134，来自 gemini-3-pro-image-preview）
+	if basePrice <= 0 {
+		basePrice = 0.134
+	}
+
+	// 4K 尺寸翻倍
+	if imageSize == "4K" {
+		return basePrice * 2
+	}
+
+	return basePrice
+}