chore: 更新依赖、配置和代码生成

主要更新：
- 更新 go.mod/go.sum 依赖
- 重新生成 Ent ORM 代码
- 更新 Wire 依赖注入配置
- 添加 docker-compose.override.yml 到 .gitignore
- 更新 README 文档（Simple Mode 说明和已知问题）
- 清理调试日志
- 其他代码优化和格式修复

backend/ent/user/where.go

@@ -722,7 +722,7 @@ func HasAPIKeys() predicate.User {
 }
 
 // HasAPIKeysWith applies the HasEdge predicate on the "api_keys" edge with a given conditions (other predicates).
-func HasAPIKeysWith(preds ...predicate.APIKey) predicate.User {
+func HasAPIKeysWith(preds ...predicate.ApiKey) predicate.User {
 	return predicate.User(func(s *sql.Selector) {
 		step := newAPIKeysStep()
 		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {

backend/ent/user_create.go

@@ -166,14 +166,14 @@ func (_c *UserCreate) SetNillableNotes(v *string) *UserCreate {
 	return _c
 }
 
-// AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
+// AddAPIKeyIDs adds the "api_keys" edge to the ApiKey entity by IDs.
 func (_c *UserCreate) AddAPIKeyIDs(ids ...int64) *UserCreate {
 	_c.mutation.AddAPIKeyIDs(ids...)
 	return _c
 }
 
-// AddAPIKeys adds the "api_keys" edges to the APIKey entity.
-func (_c *UserCreate) AddAPIKeys(v ...*APIKey) *UserCreate {
+// AddAPIKeys adds the "api_keys" edges to the ApiKey entity.
+func (_c *UserCreate) AddAPIKeys(v ...*ApiKey) *UserCreate {
 	ids := make([]int64, len(v))
 	for i := range v {
 		ids[i] = v[i].ID

backend/ent/user_query.go

@@ -30,7 +30,7 @@ type UserQuery struct {
 	order                     []user.OrderOption
 	inters                    []Interceptor
 	predicates                []predicate.User
-	withAPIKeys               *APIKeyQuery
+	withAPIKeys               *ApiKeyQuery
 	withRedeemCodes           *RedeemCodeQuery
 	withSubscriptions         *UserSubscriptionQuery
 	withAssignedSubscriptions *UserSubscriptionQuery
@@ -75,8 +75,8 @@ func (_q *UserQuery) Order(o ...user.OrderOption) *UserQuery {
 }
 
 // QueryAPIKeys chains the current query on the "api_keys" edge.
-func (_q *UserQuery) QueryAPIKeys() *APIKeyQuery {
-	query := (&APIKeyClient{config: _q.config}).Query()
+func (_q *UserQuery) QueryAPIKeys() *ApiKeyQuery {
+	query := (&ApiKeyClient{config: _q.config}).Query()
 	query.path = func(ctx context.Context) (fromU *sql.Selector, err error) {
 		if err := _q.prepareQuery(ctx); err != nil {
 			return nil, err
@@ -458,8 +458,8 @@ func (_q *UserQuery) Clone() *UserQuery {
 
 // WithAPIKeys tells the query-builder to eager-load the nodes that are connected to
 // the "api_keys" edge. The optional arguments are used to configure the query builder of the edge.
-func (_q *UserQuery) WithAPIKeys(opts ...func(*APIKeyQuery)) *UserQuery {
-	query := (&APIKeyClient{config: _q.config}).Query()
+func (_q *UserQuery) WithAPIKeys(opts ...func(*ApiKeyQuery)) *UserQuery {
+	query := (&ApiKeyClient{config: _q.config}).Query()
 	for _, opt := range opts {
 		opt(query)
 	}
@@ -653,8 +653,8 @@ func (_q *UserQuery) sqlAll(ctx context.Context, hooks ...queryHook) ([]*User, e
 	}
 	if query := _q.withAPIKeys; query != nil {
 		if err := _q.loadAPIKeys(ctx, query, nodes,
-			func(n *User) { n.Edges.APIKeys = []*APIKey{} },
-			func(n *User, e *APIKey) { n.Edges.APIKeys = append(n.Edges.APIKeys, e) }); err != nil {
+			func(n *User) { n.Edges.APIKeys = []*ApiKey{} },
+			func(n *User, e *ApiKey) { n.Edges.APIKeys = append(n.Edges.APIKeys, e) }); err != nil {
 			return nil, err
 		}
 	}
@@ -712,7 +712,7 @@ func (_q *UserQuery) sqlAll(ctx context.Context, hooks ...queryHook) ([]*User, e
 	return nodes, nil
 }
 
-func (_q *UserQuery) loadAPIKeys(ctx context.Context, query *APIKeyQuery, nodes []*User, init func(*User), assign func(*User, *APIKey)) error {
+func (_q *UserQuery) loadAPIKeys(ctx context.Context, query *ApiKeyQuery, nodes []*User, init func(*User), assign func(*User, *ApiKey)) error {
 	fks := make([]driver.Value, 0, len(nodes))
 	nodeids := make(map[int64]*User)
 	for i := range nodes {
@@ -725,7 +725,7 @@ func (_q *UserQuery) loadAPIKeys(ctx context.Context, query *APIKeyQuery, nodes
 	if len(query.ctx.Fields) > 0 {
 		query.ctx.AppendFieldOnce(apikey.FieldUserID)
 	}
-	query.Where(predicate.APIKey(func(s *sql.Selector) {
+	query.Where(predicate.ApiKey(func(s *sql.Selector) {
 		s.Where(sql.InValues(s.C(user.APIKeysColumn), fks...))
 	}))
 	neighbors, err := query.All(ctx)

backend/ent/user_update.go

@@ -186,14 +186,14 @@ func (_u *UserUpdate) SetNillableNotes(v *string) *UserUpdate {
 	return _u
 }
 
-// AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
+// AddAPIKeyIDs adds the "api_keys" edge to the ApiKey entity by IDs.
 func (_u *UserUpdate) AddAPIKeyIDs(ids ...int64) *UserUpdate {
 	_u.mutation.AddAPIKeyIDs(ids...)
 	return _u
 }
 
-// AddAPIKeys adds the "api_keys" edges to the APIKey entity.
-func (_u *UserUpdate) AddAPIKeys(v ...*APIKey) *UserUpdate {
+// AddAPIKeys adds the "api_keys" edges to the ApiKey entity.
+func (_u *UserUpdate) AddAPIKeys(v ...*ApiKey) *UserUpdate {
 	ids := make([]int64, len(v))
 	for i := range v {
 		ids[i] = v[i].ID
@@ -296,20 +296,20 @@ func (_u *UserUpdate) Mutation() *UserMutation {
 	return _u.mutation
 }
 
-// ClearAPIKeys clears all "api_keys" edges to the APIKey entity.
+// ClearAPIKeys clears all "api_keys" edges to the ApiKey entity.
 func (_u *UserUpdate) ClearAPIKeys() *UserUpdate {
 	_u.mutation.ClearAPIKeys()
 	return _u
 }
 
-// RemoveAPIKeyIDs removes the "api_keys" edge to APIKey entities by IDs.
+// RemoveAPIKeyIDs removes the "api_keys" edge to ApiKey entities by IDs.
 func (_u *UserUpdate) RemoveAPIKeyIDs(ids ...int64) *UserUpdate {
 	_u.mutation.RemoveAPIKeyIDs(ids...)
 	return _u
 }
 
-// RemoveAPIKeys removes "api_keys" edges to APIKey entities.
-func (_u *UserUpdate) RemoveAPIKeys(v ...*APIKey) *UserUpdate {
+// RemoveAPIKeys removes "api_keys" edges to ApiKey entities.
+func (_u *UserUpdate) RemoveAPIKeys(v ...*ApiKey) *UserUpdate {
 	ids := make([]int64, len(v))
 	for i := range v {
 		ids[i] = v[i].ID
@@ -1065,14 +1065,14 @@ func (_u *UserUpdateOne) SetNillableNotes(v *string) *UserUpdateOne {
 	return _u
 }
 
-// AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
+// AddAPIKeyIDs adds the "api_keys" edge to the ApiKey entity by IDs.
 func (_u *UserUpdateOne) AddAPIKeyIDs(ids ...int64) *UserUpdateOne {
 	_u.mutation.AddAPIKeyIDs(ids...)
 	return _u
 }
 
-// AddAPIKeys adds the "api_keys" edges to the APIKey entity.
-func (_u *UserUpdateOne) AddAPIKeys(v ...*APIKey) *UserUpdateOne {
+// AddAPIKeys adds the "api_keys" edges to the ApiKey entity.
+func (_u *UserUpdateOne) AddAPIKeys(v ...*ApiKey) *UserUpdateOne {
 	ids := make([]int64, len(v))
 	for i := range v {
 		ids[i] = v[i].ID
@@ -1175,20 +1175,20 @@ func (_u *UserUpdateOne) Mutation() *UserMutation {
 	return _u.mutation
 }
 
-// ClearAPIKeys clears all "api_keys" edges to the APIKey entity.
+// ClearAPIKeys clears all "api_keys" edges to the ApiKey entity.
 func (_u *UserUpdateOne) ClearAPIKeys() *UserUpdateOne {
 	_u.mutation.ClearAPIKeys()
 	return _u
 }
 
-// RemoveAPIKeyIDs removes the "api_keys" edge to APIKey entities by IDs.
+// RemoveAPIKeyIDs removes the "api_keys" edge to ApiKey entities by IDs.
 func (_u *UserUpdateOne) RemoveAPIKeyIDs(ids ...int64) *UserUpdateOne {
 	_u.mutation.RemoveAPIKeyIDs(ids...)
 	return _u
 }
 
-// RemoveAPIKeys removes "api_keys" edges to APIKey entities.
-func (_u *UserUpdateOne) RemoveAPIKeys(v ...*APIKey) *UserUpdateOne {
+// RemoveAPIKeys removes "api_keys" edges to ApiKey entities.
+func (_u *UserUpdateOne) RemoveAPIKeys(v ...*ApiKey) *UserUpdateOne {
 	ids := make([]int64, len(v))
 	for i := range v {
 		ids[i] = v[i].ID

backend/go.mod

@@ -69,7 +69,6 @@ require (
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/subcommands v1.2.0 // indirect
-	github.com/gorilla/websocket v1.5.3 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/hashicorp/hcl/v2 v2.18.1 // indirect

backend/go.sum

@@ -118,8 +118,6 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/wire v0.7.0 h1:JxUKI6+CVBgCO2WToKy/nQk0sS+amI9z9EjVmdaocj4=
 github.com/google/wire v0.7.0/go.mod h1:n6YbUQD9cPKTnHXEBN2DXlOp/mVADhVErcMFb0v3J18=
-github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
-github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3 h1:NmZ1PKzSTQbuGHw9DGPFomqkkLWMC+vZCkfs+FHv1Vg=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3/go.mod h1:zQrxl1YP88HQlA6i9c63DSVPFklWpGX4OWAc9bFuaH4=
 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=

backend/internal/config/config.go

-// Package config provides application configuration management.
 package config
 
 import (
@@ -140,7 +139,7 @@ type GatewayConfig struct {
 	LogUpstreamErrorBodyMaxBytes int `mapstructure:"log_upstream_error_body_max_bytes"`
 
 	// API-key 账号在客户端未提供 anthropic-beta 时，是否按需自动补齐（默认关闭以保持兼容）
-	InjectBetaForAPIKey bool `mapstructure:"inject_beta_for_apikey"`
+	InjectBetaForApiKey bool `mapstructure:"inject_beta_for_apikey"`
 
 	// 是否允许对部分 400 错误触发 failover（默认关闭以避免改变语义）
 	FailoverOn400 bool `mapstructure:"failover_on_400"`
@@ -242,7 +241,7 @@ type DefaultConfig struct {
 	AdminPassword   string  `mapstructure:"admin_password"`
 	UserConcurrency int     `mapstructure:"user_concurrency"`
 	UserBalance     float64 `mapstructure:"user_balance"`
-	APIKeyPrefix    string  `mapstructure:"api_key_prefix"`
+	ApiKeyPrefix    string  `mapstructure:"api_key_prefix"`
 	RateMultiplier  float64 `mapstructure:"rate_multiplier"`
 }
 

backend/internal/config/wire.go

-// Package config provides application configuration management.
 package config
 
 import "github.com/google/wire"

backend/internal/handler/admin/dashboard_handler.go

-// Package admin provides HTTP handlers for administrative operations including
-// dashboard statistics, user management, API key management, and account management.
 package admin
 
 import (
@@ -77,8 +75,8 @@ func (h *DashboardHandler) GetStats(c *gin.Context) {
 		"active_users":    stats.ActiveUsers,
 
 		// API Key 统计
-		"total_api_keys":  stats.TotalAPIKeys,
-		"active_api_keys": stats.ActiveAPIKeys,
+		"total_api_keys":  stats.TotalApiKeys,
+		"active_api_keys": stats.ActiveApiKeys,
 
 		// 账户统计
 		"total_accounts":     stats.TotalAccounts,
@@ -195,10 +193,10 @@ func (h *DashboardHandler) GetModelStats(c *gin.Context) {
 	})
 }
 
-// GetAPIKeyUsageTrend handles getting API key usage trend data
+// GetApiKeyUsageTrend handles getting API key usage trend data
 // GET /api/v1/admin/dashboard/api-keys-trend
 // Query params: start_date, end_date (YYYY-MM-DD), granularity (day/hour), limit (default 5)
-func (h *DashboardHandler) GetAPIKeyUsageTrend(c *gin.Context) {
+func (h *DashboardHandler) GetApiKeyUsageTrend(c *gin.Context) {
 	startTime, endTime := parseTimeRange(c)
 	granularity := c.DefaultQuery("granularity", "day")
 	limitStr := c.DefaultQuery("limit", "5")
@@ -207,7 +205,7 @@ func (h *DashboardHandler) GetAPIKeyUsageTrend(c *gin.Context) {
 		limit = 5
 	}
 
-	trend, err := h.dashboardService.GetAPIKeyUsageTrend(c.Request.Context(), startTime, endTime, granularity, limit)
+	trend, err := h.dashboardService.GetApiKeyUsageTrend(c.Request.Context(), startTime, endTime, granularity, limit)
 	if err != nil {
 		response.Error(c, 500, "Failed to get API key usage trend")
 		return
@@ -275,26 +273,26 @@ func (h *DashboardHandler) GetBatchUsersUsage(c *gin.Context) {
 	response.Success(c, gin.H{"stats": stats})
 }
 
-// BatchAPIKeysUsageRequest represents the request body for batch api key usage stats
-type BatchAPIKeysUsageRequest struct {
-	APIKeyIDs []int64 `json:"api_key_ids" binding:"required"`
+// BatchApiKeysUsageRequest represents the request body for batch api key usage stats
+type BatchApiKeysUsageRequest struct {
+	ApiKeyIDs []int64 `json:"api_key_ids" binding:"required"`
 }
 
-// GetBatchAPIKeysUsage handles getting usage stats for multiple API keys
+// GetBatchApiKeysUsage handles getting usage stats for multiple API keys
 // POST /api/v1/admin/dashboard/api-keys-usage
-func (h *DashboardHandler) GetBatchAPIKeysUsage(c *gin.Context) {
-	var req BatchAPIKeysUsageRequest
+func (h *DashboardHandler) GetBatchApiKeysUsage(c *gin.Context) {
+	var req BatchApiKeysUsageRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
 		response.BadRequest(c, "Invalid request: "+err.Error())
 		return
 	}
 
-	if len(req.APIKeyIDs) == 0 {
+	if len(req.ApiKeyIDs) == 0 {
 		response.Success(c, gin.H{"stats": map[string]any{}})
 		return
 	}
 
-	stats, err := h.dashboardService.GetBatchAPIKeyUsageStats(c.Request.Context(), req.APIKeyIDs)
+	stats, err := h.dashboardService.GetBatchApiKeyUsageStats(c.Request.Context(), req.ApiKeyIDs)
 	if err != nil {
 		response.Error(c, 500, "Failed to get API key usage stats")
 		return

backend/internal/handler/admin/group_handler.go

@@ -237,9 +237,9 @@ func (h *GroupHandler) GetGroupAPIKeys(c *gin.Context) {
 		return
 	}
 
-	outKeys := make([]dto.APIKey, 0, len(keys))
+	outKeys := make([]dto.ApiKey, 0, len(keys))
 	for i := range keys {
-		outKeys = append(outKeys, *dto.APIKeyFromService(&keys[i]))
+		outKeys = append(outKeys, *dto.ApiKeyFromService(&keys[i]))
 	}
 	response.Paginated(c, outKeys, total, page, pageSize)
 }

backend/internal/handler/admin/setting_handler.go

@@ -36,24 +36,29 @@ func (h *SettingHandler) GetSettings(c *gin.Context) {
 	response.Success(c, dto.SystemSettings{
 		RegistrationEnabled: settings.RegistrationEnabled,
 		EmailVerifyEnabled:  settings.EmailVerifyEnabled,
-		SMTPHost:            settings.SMTPHost,
-		SMTPPort:            settings.SMTPPort,
-		SMTPUsername:        settings.SMTPUsername,
-		SMTPPassword:        settings.SMTPPassword,
-		SMTPFrom:            settings.SMTPFrom,
-		SMTPFromName:        settings.SMTPFromName,
-		SMTPUseTLS:          settings.SMTPUseTLS,
+		SmtpHost:            settings.SmtpHost,
+		SmtpPort:            settings.SmtpPort,
+		SmtpUsername:        settings.SmtpUsername,
+		SmtpPassword:        settings.SmtpPassword,
+		SmtpFrom:            settings.SmtpFrom,
+		SmtpFromName:        settings.SmtpFromName,
+		SmtpUseTLS:          settings.SmtpUseTLS,
 		TurnstileEnabled:    settings.TurnstileEnabled,
 		TurnstileSiteKey:    settings.TurnstileSiteKey,
 		TurnstileSecretKey:  settings.TurnstileSecretKey,
 		SiteName:            settings.SiteName,
 		SiteLogo:            settings.SiteLogo,
 		SiteSubtitle:        settings.SiteSubtitle,
-		APIBaseURL:          settings.APIBaseURL,
+		ApiBaseUrl:          settings.ApiBaseUrl,
 		ContactInfo:         settings.ContactInfo,
-		DocURL:              settings.DocURL,
+		DocUrl:              settings.DocUrl,
 		DefaultConcurrency:  settings.DefaultConcurrency,
 		DefaultBalance:      settings.DefaultBalance,
+		EnableModelFallback:      settings.EnableModelFallback,
+		FallbackModelAnthropic:   settings.FallbackModelAnthropic,
+		FallbackModelOpenAI:      settings.FallbackModelOpenAI,
+		FallbackModelGemini:      settings.FallbackModelGemini,
+		FallbackModelAntigravity: settings.FallbackModelAntigravity,
 	})
 }
 
@@ -64,13 +69,13 @@ type UpdateSettingsRequest struct {
 	EmailVerifyEnabled  bool `json:"email_verify_enabled"`
 
 	// 邮件服务设置
-	SMTPHost     string `json:"smtp_host"`
-	SMTPPort     int    `json:"smtp_port"`
-	SMTPUsername string `json:"smtp_username"`
-	SMTPPassword string `json:"smtp_password"`
-	SMTPFrom     string `json:"smtp_from_email"`
-	SMTPFromName string `json:"smtp_from_name"`
-	SMTPUseTLS   bool   `json:"smtp_use_tls"`
+	SmtpHost     string `json:"smtp_host"`
+	SmtpPort     int    `json:"smtp_port"`
+	SmtpUsername string `json:"smtp_username"`
+	SmtpPassword string `json:"smtp_password"`
+	SmtpFrom     string `json:"smtp_from_email"`
+	SmtpFromName string `json:"smtp_from_name"`
+	SmtpUseTLS   bool   `json:"smtp_use_tls"`
 
 	// Cloudflare Turnstile 设置
 	TurnstileEnabled   bool   `json:"turnstile_enabled"`
@@ -81,13 +86,20 @@ type UpdateSettingsRequest struct {
 	SiteName     string `json:"site_name"`
 	SiteLogo     string `json:"site_logo"`
 	SiteSubtitle string `json:"site_subtitle"`
-	APIBaseURL   string `json:"api_base_url"`
+	ApiBaseUrl   string `json:"api_base_url"`
 	ContactInfo  string `json:"contact_info"`
-	DocURL       string `json:"doc_url"`
+	DocUrl       string `json:"doc_url"`
 
 	// 默认配置
 	DefaultConcurrency int     `json:"default_concurrency"`
 	DefaultBalance     float64 `json:"default_balance"`
+
+	// Model fallback configuration
+	EnableModelFallback      bool   `json:"enable_model_fallback"`
+	FallbackModelAnthropic   string `json:"fallback_model_anthropic"`
+	FallbackModelOpenAI      string `json:"fallback_model_openai"`
+	FallbackModelGemini      string `json:"fallback_model_gemini"`
+	FallbackModelAntigravity string `json:"fallback_model_antigravity"`
 }
 
 // UpdateSettings 更新系统设置
@@ -106,8 +118,8 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 	if req.DefaultBalance < 0 {
 		req.DefaultBalance = 0
 	}
-	if req.SMTPPort <= 0 {
-		req.SMTPPort = 587
+	if req.SmtpPort <= 0 {
+		req.SmtpPort = 587
 	}
 
 	// Turnstile 参数验证
@@ -143,24 +155,29 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 	settings := &service.SystemSettings{
 		RegistrationEnabled: req.RegistrationEnabled,
 		EmailVerifyEnabled:  req.EmailVerifyEnabled,
-		SMTPHost:            req.SMTPHost,
-		SMTPPort:            req.SMTPPort,
-		SMTPUsername:        req.SMTPUsername,
-		SMTPPassword:        req.SMTPPassword,
-		SMTPFrom:            req.SMTPFrom,
-		SMTPFromName:        req.SMTPFromName,
-		SMTPUseTLS:          req.SMTPUseTLS,
+		SmtpHost:            req.SmtpHost,
+		SmtpPort:            req.SmtpPort,
+		SmtpUsername:        req.SmtpUsername,
+		SmtpPassword:        req.SmtpPassword,
+		SmtpFrom:            req.SmtpFrom,
+		SmtpFromName:        req.SmtpFromName,
+		SmtpUseTLS:          req.SmtpUseTLS,
 		TurnstileEnabled:    req.TurnstileEnabled,
 		TurnstileSiteKey:    req.TurnstileSiteKey,
 		TurnstileSecretKey:  req.TurnstileSecretKey,
 		SiteName:            req.SiteName,
 		SiteLogo:            req.SiteLogo,
 		SiteSubtitle:        req.SiteSubtitle,
-		APIBaseURL:          req.APIBaseURL,
+		ApiBaseUrl:          req.ApiBaseUrl,
 		ContactInfo:         req.ContactInfo,
-		DocURL:              req.DocURL,
+		DocUrl:              req.DocUrl,
 		DefaultConcurrency:  req.DefaultConcurrency,
 		DefaultBalance:      req.DefaultBalance,
+		EnableModelFallback:      req.EnableModelFallback,
+		FallbackModelAnthropic:   req.FallbackModelAnthropic,
+		FallbackModelOpenAI:      req.FallbackModelOpenAI,
+		FallbackModelGemini:      req.FallbackModelGemini,
+		FallbackModelAntigravity: req.FallbackModelAntigravity,
 	}
 
 	if err := h.settingService.UpdateSettings(c.Request.Context(), settings); err != nil {
@@ -178,67 +195,72 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 	response.Success(c, dto.SystemSettings{
 		RegistrationEnabled: updatedSettings.RegistrationEnabled,
 		EmailVerifyEnabled:  updatedSettings.EmailVerifyEnabled,
-		SMTPHost:            updatedSettings.SMTPHost,
-		SMTPPort:            updatedSettings.SMTPPort,
-		SMTPUsername:        updatedSettings.SMTPUsername,
-		SMTPPassword:        updatedSettings.SMTPPassword,
-		SMTPFrom:            updatedSettings.SMTPFrom,
-		SMTPFromName:        updatedSettings.SMTPFromName,
-		SMTPUseTLS:          updatedSettings.SMTPUseTLS,
+		SmtpHost:            updatedSettings.SmtpHost,
+		SmtpPort:            updatedSettings.SmtpPort,
+		SmtpUsername:        updatedSettings.SmtpUsername,
+		SmtpPassword:        updatedSettings.SmtpPassword,
+		SmtpFrom:            updatedSettings.SmtpFrom,
+		SmtpFromName:        updatedSettings.SmtpFromName,
+		SmtpUseTLS:          updatedSettings.SmtpUseTLS,
 		TurnstileEnabled:    updatedSettings.TurnstileEnabled,
 		TurnstileSiteKey:    updatedSettings.TurnstileSiteKey,
 		TurnstileSecretKey:  updatedSettings.TurnstileSecretKey,
 		SiteName:            updatedSettings.SiteName,
 		SiteLogo:            updatedSettings.SiteLogo,
 		SiteSubtitle:        updatedSettings.SiteSubtitle,
-		APIBaseURL:          updatedSettings.APIBaseURL,
+		ApiBaseUrl:          updatedSettings.ApiBaseUrl,
 		ContactInfo:         updatedSettings.ContactInfo,
-		DocURL:              updatedSettings.DocURL,
+		DocUrl:              updatedSettings.DocUrl,
 		DefaultConcurrency:  updatedSettings.DefaultConcurrency,
 		DefaultBalance:      updatedSettings.DefaultBalance,
+		EnableModelFallback:      updatedSettings.EnableModelFallback,
+		FallbackModelAnthropic:   updatedSettings.FallbackModelAnthropic,
+		FallbackModelOpenAI:      updatedSettings.FallbackModelOpenAI,
+		FallbackModelGemini:      updatedSettings.FallbackModelGemini,
+		FallbackModelAntigravity: updatedSettings.FallbackModelAntigravity,
 	})
 }
 
-// TestSMTPRequest 测试SMTP连接请求
-type TestSMTPRequest struct {
-	SMTPHost     string `json:"smtp_host" binding:"required"`
-	SMTPPort     int    `json:"smtp_port"`
-	SMTPUsername string `json:"smtp_username"`
-	SMTPPassword string `json:"smtp_password"`
-	SMTPUseTLS   bool   `json:"smtp_use_tls"`
+// TestSmtpRequest 测试SMTP连接请求
+type TestSmtpRequest struct {
+	SmtpHost     string `json:"smtp_host" binding:"required"`
+	SmtpPort     int    `json:"smtp_port"`
+	SmtpUsername string `json:"smtp_username"`
+	SmtpPassword string `json:"smtp_password"`
+	SmtpUseTLS   bool   `json:"smtp_use_tls"`
 }
 
-// TestSMTPConnection 测试SMTP连接
+// TestSmtpConnection 测试SMTP连接
 // POST /api/v1/admin/settings/test-smtp
-func (h *SettingHandler) TestSMTPConnection(c *gin.Context) {
-	var req TestSMTPRequest
+func (h *SettingHandler) TestSmtpConnection(c *gin.Context) {
+	var req TestSmtpRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
 		response.BadRequest(c, "Invalid request: "+err.Error())
 		return
 	}
 
-	if req.SMTPPort <= 0 {
-		req.SMTPPort = 587
+	if req.SmtpPort <= 0 {
+		req.SmtpPort = 587
 	}
 
 	// 如果未提供密码，从数据库获取已保存的密码
-	password := req.SMTPPassword
+	password := req.SmtpPassword
 	if password == "" {
-		savedConfig, err := h.emailService.GetSMTPConfig(c.Request.Context())
+		savedConfig, err := h.emailService.GetSmtpConfig(c.Request.Context())
 		if err == nil && savedConfig != nil {
 			password = savedConfig.Password
 		}
 	}
 
-	config := &service.SMTPConfig{
-		Host:     req.SMTPHost,
-		Port:     req.SMTPPort,
-		Username: req.SMTPUsername,
+	config := &service.SmtpConfig{
+		Host:     req.SmtpHost,
+		Port:     req.SmtpPort,
+		Username: req.SmtpUsername,
 		Password: password,
-		UseTLS:   req.SMTPUseTLS,
+		UseTLS:   req.SmtpUseTLS,
 	}
 
-	err := h.emailService.TestSMTPConnectionWithConfig(config)
+	err := h.emailService.TestSmtpConnectionWithConfig(config)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -250,13 +272,13 @@ func (h *SettingHandler) TestSMTPConnection(c *gin.Context) {
 // SendTestEmailRequest 发送测试邮件请求
 type SendTestEmailRequest struct {
 	Email        string `json:"email" binding:"required,email"`
-	SMTPHost     string `json:"smtp_host" binding:"required"`
-	SMTPPort     int    `json:"smtp_port"`
-	SMTPUsername string `json:"smtp_username"`
-	SMTPPassword string `json:"smtp_password"`
-	SMTPFrom     string `json:"smtp_from_email"`
-	SMTPFromName string `json:"smtp_from_name"`
-	SMTPUseTLS   bool   `json:"smtp_use_tls"`
+	SmtpHost     string `json:"smtp_host" binding:"required"`
+	SmtpPort     int    `json:"smtp_port"`
+	SmtpUsername string `json:"smtp_username"`
+	SmtpPassword string `json:"smtp_password"`
+	SmtpFrom     string `json:"smtp_from_email"`
+	SmtpFromName string `json:"smtp_from_name"`
+	SmtpUseTLS   bool   `json:"smtp_use_tls"`
 }
 
 // SendTestEmail 发送测试邮件
@@ -268,27 +290,27 @@ func (h *SettingHandler) SendTestEmail(c *gin.Context) {
 		return
 	}
 
-	if req.SMTPPort <= 0 {
-		req.SMTPPort = 587
+	if req.SmtpPort <= 0 {
+		req.SmtpPort = 587
 	}
 
 	// 如果未提供密码，从数据库获取已保存的密码
-	password := req.SMTPPassword
+	password := req.SmtpPassword
 	if password == "" {
-		savedConfig, err := h.emailService.GetSMTPConfig(c.Request.Context())
+		savedConfig, err := h.emailService.GetSmtpConfig(c.Request.Context())
 		if err == nil && savedConfig != nil {
 			password = savedConfig.Password
 		}
 	}
 
-	config := &service.SMTPConfig{
-		Host:     req.SMTPHost,
-		Port:     req.SMTPPort,
-		Username: req.SMTPUsername,
+	config := &service.SmtpConfig{
+		Host:     req.SmtpHost,
+		Port:     req.SmtpPort,
+		Username: req.SmtpUsername,
 		Password: password,
-		From:     req.SMTPFrom,
-		FromName: req.SMTPFromName,
-		UseTLS:   req.SMTPUseTLS,
+		From:     req.SmtpFrom,
+		FromName: req.SmtpFromName,
+		UseTLS:   req.SmtpUseTLS,
 	}
 
 	siteName := h.settingService.GetSiteName(c.Request.Context())
@@ -333,10 +355,10 @@ func (h *SettingHandler) SendTestEmail(c *gin.Context) {
 	response.Success(c, gin.H{"message": "Test email sent successfully"})
 }
 
-// GetAdminAPIKey 获取管理员 API Key 状态
+// GetAdminApiKey 获取管理员 API Key 状态
 // GET /api/v1/admin/settings/admin-api-key
-func (h *SettingHandler) GetAdminAPIKey(c *gin.Context) {
-	maskedKey, exists, err := h.settingService.GetAdminAPIKeyStatus(c.Request.Context())
+func (h *SettingHandler) GetAdminApiKey(c *gin.Context) {
+	maskedKey, exists, err := h.settingService.GetAdminApiKeyStatus(c.Request.Context())
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -348,10 +370,10 @@ func (h *SettingHandler) GetAdminAPIKey(c *gin.Context) {
 	})
 }
 
-// RegenerateAdminAPIKey 生成/重新生成管理员 API Key
+// RegenerateAdminApiKey 生成/重新生成管理员 API Key
 // POST /api/v1/admin/settings/admin-api-key/regenerate
-func (h *SettingHandler) RegenerateAdminAPIKey(c *gin.Context) {
-	key, err := h.settingService.GenerateAdminAPIKey(c.Request.Context())
+func (h *SettingHandler) RegenerateAdminApiKey(c *gin.Context) {
+	key, err := h.settingService.GenerateAdminApiKey(c.Request.Context())
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -362,10 +384,10 @@ func (h *SettingHandler) RegenerateAdminAPIKey(c *gin.Context) {
 	})
 }
 
-// DeleteAdminAPIKey 删除管理员 API Key
+// DeleteAdminApiKey 删除管理员 API Key
 // DELETE /api/v1/admin/settings/admin-api-key
-func (h *SettingHandler) DeleteAdminAPIKey(c *gin.Context) {
-	if err := h.settingService.DeleteAdminAPIKey(c.Request.Context()); err != nil {
+func (h *SettingHandler) DeleteAdminApiKey(c *gin.Context) {
+	if err := h.settingService.DeleteAdminApiKey(c.Request.Context()); err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

backend/internal/handler/admin/usage_handler.go

@@ -17,14 +17,14 @@ import (
 // UsageHandler handles admin usage-related requests
 type UsageHandler struct {
 	usageService  *service.UsageService
-	apiKeyService *service.APIKeyService
+	apiKeyService *service.ApiKeyService
 	adminService  service.AdminService
 }
 
 // NewUsageHandler creates a new admin usage handler
 func NewUsageHandler(
 	usageService *service.UsageService,
-	apiKeyService *service.APIKeyService,
+	apiKeyService *service.ApiKeyService,
 	adminService service.AdminService,
 ) *UsageHandler {
 	return &UsageHandler{
@@ -125,7 +125,7 @@ func (h *UsageHandler) List(c *gin.Context) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	filters := usagestats.UsageLogFilters{
 		UserID:      userID,
-		APIKeyID:    apiKeyID,
+		ApiKeyID:    apiKeyID,
 		AccountID:   accountID,
 		GroupID:     groupID,
 		Model:       model,
@@ -207,7 +207,7 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 	}
 
 	if apiKeyID > 0 {
-		stats, err := h.usageService.GetStatsByAPIKey(c.Request.Context(), apiKeyID, startTime, endTime)
+		stats, err := h.usageService.GetStatsByApiKey(c.Request.Context(), apiKeyID, startTime, endTime)
 		if err != nil {
 			response.ErrorFrom(c, err)
 			return
@@ -269,9 +269,9 @@ func (h *UsageHandler) SearchUsers(c *gin.Context) {
 	response.Success(c, result)
 }
 
-// SearchAPIKeys handles searching API keys by user
+// SearchApiKeys handles searching API keys by user
 // GET /api/v1/admin/usage/search-api-keys
-func (h *UsageHandler) SearchAPIKeys(c *gin.Context) {
+func (h *UsageHandler) SearchApiKeys(c *gin.Context) {
 	userIDStr := c.Query("user_id")
 	keyword := c.Query("q")
 
@@ -285,22 +285,22 @@ func (h *UsageHandler) SearchAPIKeys(c *gin.Context) {
 		userID = id
 	}
 
-	keys, err := h.apiKeyService.SearchAPIKeys(c.Request.Context(), userID, keyword, 30)
+	keys, err := h.apiKeyService.SearchApiKeys(c.Request.Context(), userID, keyword, 30)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}
 
 	// Return simplified API key list (only id and name)
-	type SimpleAPIKey struct {
+	type SimpleApiKey struct {
 		ID     int64  `json:"id"`
 		Name   string `json:"name"`
 		UserID int64  `json:"user_id"`
 	}
 
-	result := make([]SimpleAPIKey, len(keys))
+	result := make([]SimpleApiKey, len(keys))
 	for i, k := range keys {
-		result[i] = SimpleAPIKey{
+		result[i] = SimpleApiKey{
 			ID:     k.ID,
 			Name:   k.Name,
 			UserID: k.UserID,

backend/internal/handler/admin/user_handler.go

@@ -243,9 +243,9 @@ func (h *UserHandler) GetUserAPIKeys(c *gin.Context) {
 		return
 	}
 
-	out := make([]dto.APIKey, 0, len(keys))
+	out := make([]dto.ApiKey, 0, len(keys))
 	for i := range keys {
-		out = append(out, *dto.APIKeyFromService(&keys[i]))
+		out = append(out, *dto.ApiKeyFromService(&keys[i]))
 	}
 	response.Paginated(c, out, total, page, pageSize)
 }

backend/internal/handler/api_key_handler.go

@@ -14,11 +14,11 @@ import (
 
 // APIKeyHandler handles API key-related requests
 type APIKeyHandler struct {
-	apiKeyService *service.APIKeyService
+	apiKeyService *service.ApiKeyService
 }
 
 // NewAPIKeyHandler creates a new APIKeyHandler
-func NewAPIKeyHandler(apiKeyService *service.APIKeyService) *APIKeyHandler {
+func NewAPIKeyHandler(apiKeyService *service.ApiKeyService) *APIKeyHandler {
 	return &APIKeyHandler{
 		apiKeyService: apiKeyService,
 	}
@@ -56,9 +56,9 @@ func (h *APIKeyHandler) List(c *gin.Context) {
 		return
 	}
 
-	out := make([]dto.APIKey, 0, len(keys))
+	out := make([]dto.ApiKey, 0, len(keys))
 	for i := range keys {
-		out = append(out, *dto.APIKeyFromService(&keys[i]))
+		out = append(out, *dto.ApiKeyFromService(&keys[i]))
 	}
 	response.Paginated(c, out, result.Total, page, pageSize)
 }
@@ -90,7 +90,7 @@ func (h *APIKeyHandler) GetByID(c *gin.Context) {
 		return
 	}
 
-	response.Success(c, dto.APIKeyFromService(key))
+	response.Success(c, dto.ApiKeyFromService(key))
 }
 
 // Create handles creating a new API key
@@ -108,7 +108,7 @@ func (h *APIKeyHandler) Create(c *gin.Context) {
 		return
 	}
 
-	svcReq := service.CreateAPIKeyRequest{
+	svcReq := service.CreateApiKeyRequest{
 		Name:      req.Name,
 		GroupID:   req.GroupID,
 		CustomKey: req.CustomKey,
@@ -119,7 +119,7 @@ func (h *APIKeyHandler) Create(c *gin.Context) {
 		return
 	}
 
-	response.Success(c, dto.APIKeyFromService(key))
+	response.Success(c, dto.ApiKeyFromService(key))
 }
 
 // Update handles updating an API key
@@ -143,7 +143,7 @@ func (h *APIKeyHandler) Update(c *gin.Context) {
 		return
 	}
 
-	svcReq := service.UpdateAPIKeyRequest{}
+	svcReq := service.UpdateApiKeyRequest{}
 	if req.Name != "" {
 		svcReq.Name = &req.Name
 	}
@@ -158,7 +158,7 @@ func (h *APIKeyHandler) Update(c *gin.Context) {
 		return
 	}
 
-	response.Success(c, dto.APIKeyFromService(key))
+	response.Success(c, dto.ApiKeyFromService(key))
 }
 
 // Delete handles deleting an API key

backend/internal/handler/dto/settings.go

@@ -5,13 +5,13 @@ type SystemSettings struct {
 	RegistrationEnabled bool `json:"registration_enabled"`
 	EmailVerifyEnabled  bool `json:"email_verify_enabled"`
 
-	SMTPHost     string `json:"smtp_host"`
-	SMTPPort     int    `json:"smtp_port"`
-	SMTPUsername string `json:"smtp_username"`
-	SMTPPassword string `json:"smtp_password,omitempty"`
-	SMTPFrom     string `json:"smtp_from_email"`
-	SMTPFromName string `json:"smtp_from_name"`
-	SMTPUseTLS   bool   `json:"smtp_use_tls"`
+	SmtpHost     string `json:"smtp_host"`
+	SmtpPort     int    `json:"smtp_port"`
+	SmtpUsername string `json:"smtp_username"`
+	SmtpPassword string `json:"smtp_password,omitempty"`
+	SmtpFrom     string `json:"smtp_from_email"`
+	SmtpFromName string `json:"smtp_from_name"`
+	SmtpUseTLS   bool   `json:"smtp_use_tls"`
 
 	TurnstileEnabled   bool   `json:"turnstile_enabled"`
 	TurnstileSiteKey   string `json:"turnstile_site_key"`
@@ -20,12 +20,19 @@ type SystemSettings struct {
 	SiteName     string `json:"site_name"`
 	SiteLogo     string `json:"site_logo"`
 	SiteSubtitle string `json:"site_subtitle"`
-	APIBaseURL   string `json:"api_base_url"`
+	ApiBaseUrl   string `json:"api_base_url"`
 	ContactInfo  string `json:"contact_info"`
-	DocURL       string `json:"doc_url"`
+	DocUrl       string `json:"doc_url"`
 
 	DefaultConcurrency int     `json:"default_concurrency"`
 	DefaultBalance     float64 `json:"default_balance"`
+
+	// Model fallback configuration
+	EnableModelFallback      bool   `json:"enable_model_fallback"`
+	FallbackModelAnthropic   string `json:"fallback_model_anthropic"`
+	FallbackModelOpenAI      string `json:"fallback_model_openai"`
+	FallbackModelGemini      string `json:"fallback_model_gemini"`
+	FallbackModelAntigravity string `json:"fallback_model_antigravity"`
 }
 
 type PublicSettings struct {
@@ -36,8 +43,8 @@ type PublicSettings struct {
 	SiteName            string `json:"site_name"`
 	SiteLogo            string `json:"site_logo"`
 	SiteSubtitle        string `json:"site_subtitle"`
-	APIBaseURL          string `json:"api_base_url"`
+	ApiBaseUrl          string `json:"api_base_url"`
 	ContactInfo         string `json:"contact_info"`
-	DocURL              string `json:"doc_url"`
+	DocUrl              string `json:"doc_url"`
 	Version             string `json:"version"`
 }

backend/internal/handler/handler.go

@@ -7,7 +7,6 @@ import (
 // AdminHandlers contains all admin-related HTTP handlers
 type AdminHandlers struct {
 	Dashboard        *admin.DashboardHandler
-	Ops              *admin.OpsHandler
 	User             *admin.UserHandler
 	Group            *admin.GroupHandler
 	Account          *admin.AccountHandler

backend/internal/handler/openai_gateway_handler.go

@@ -22,7 +22,6 @@ type OpenAIGatewayHandler struct {
 	gatewayService      *service.OpenAIGatewayService
 	billingCacheService *service.BillingCacheService
 	concurrencyHelper   *ConcurrencyHelper
-	opsService          *service.OpsService
 }
 
 // NewOpenAIGatewayHandler creates a new OpenAIGatewayHandler
@@ -30,21 +29,19 @@ func NewOpenAIGatewayHandler(
 	gatewayService *service.OpenAIGatewayService,
 	concurrencyService *service.ConcurrencyService,
 	billingCacheService *service.BillingCacheService,
-	opsService *service.OpsService,
 ) *OpenAIGatewayHandler {
 	return &OpenAIGatewayHandler{
 		gatewayService:      gatewayService,
 		billingCacheService: billingCacheService,
 		concurrencyHelper:   NewConcurrencyHelper(concurrencyService, SSEPingFormatNone),
-		opsService:          opsService,
 	}
 }
 
 // Responses handles OpenAI Responses API endpoint
 // POST /openai/v1/responses
 func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
-	// Get apiKey and user from context (set by APIKeyAuth middleware)
-	apiKey, ok := middleware2.GetAPIKeyFromContext(c)
+	// Get apiKey and user from context (set by ApiKeyAuth middleware)
+	apiKey, ok := middleware2.GetApiKeyFromContext(c)
 	if !ok {
 		h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
 		return
@@ -82,7 +79,6 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 	// Extract model and stream
 	reqModel, _ := reqBody["model"].(string)
 	reqStream, _ := reqBody["stream"].(bool)
-	setOpsRequestContext(c, reqModel, reqStream)
 
 	// 验证 model 必填
 	if reqModel == "" {
@@ -239,7 +235,7 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 			defer cancel()
 			if err := h.gatewayService.RecordUsage(ctx, &service.OpenAIRecordUsageInput{
 				Result:       result,
-				APIKey:       apiKey,
+				ApiKey:       apiKey,
 				User:         apiKey.User,
 				Account:      usedAccount,
 				Subscription: subscription,
@@ -282,7 +278,6 @@ func (h *OpenAIGatewayHandler) mapUpstreamError(statusCode int) (int, string, st
 // handleStreamingAwareError handles errors that may occur after streaming has started
 func (h *OpenAIGatewayHandler) handleStreamingAwareError(c *gin.Context, status int, errType, message string, streamStarted bool) {
 	if streamStarted {
-		recordOpsError(c, h.opsService, status, errType, message, service.PlatformOpenAI)
 		// Stream already started, send error as SSE event then close
 		flusher, ok := c.Writer.(http.Flusher)
 		if ok {
@@ -302,7 +297,6 @@ func (h *OpenAIGatewayHandler) handleStreamingAwareError(c *gin.Context, status
 
 // errorResponse returns OpenAI API format error response
 func (h *OpenAIGatewayHandler) errorResponse(c *gin.Context, status int, errType, message string) {
-	recordOpsError(c, h.opsService, status, errType, message, service.PlatformOpenAI)
 	c.JSON(status, gin.H{
 		"error": gin.H{
 			"type":    errType,

backend/internal/handler/setting_handler.go

@@ -39,9 +39,9 @@ func (h *SettingHandler) GetPublicSettings(c *gin.Context) {
 		SiteName:            settings.SiteName,
 		SiteLogo:            settings.SiteLogo,
 		SiteSubtitle:        settings.SiteSubtitle,
-		APIBaseURL:          settings.APIBaseURL,
+		ApiBaseUrl:          settings.ApiBaseUrl,
 		ContactInfo:         settings.ContactInfo,
-		DocURL:              settings.DocURL,
+		DocUrl:              settings.DocUrl,
 		Version:             h.version,
 	})
 }

backend/internal/handler/usage_handler.go

@@ -18,11 +18,11 @@ import (
 // UsageHandler handles usage-related requests
 type UsageHandler struct {
 	usageService  *service.UsageService
-	apiKeyService *service.APIKeyService
+	apiKeyService *service.ApiKeyService
 }
 
 // NewUsageHandler creates a new UsageHandler
-func NewUsageHandler(usageService *service.UsageService, apiKeyService *service.APIKeyService) *UsageHandler {
+func NewUsageHandler(usageService *service.UsageService, apiKeyService *service.ApiKeyService) *UsageHandler {
 	return &UsageHandler{
 		usageService:  usageService,
 		apiKeyService: apiKeyService,
@@ -111,7 +111,7 @@ func (h *UsageHandler) List(c *gin.Context) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	filters := usagestats.UsageLogFilters{
 		UserID:      subject.UserID, // Always filter by current user for security
-		APIKeyID:    apiKeyID,
+		ApiKeyID:    apiKeyID,
 		Model:       model,
 		Stream:      stream,
 		BillingType: billingType,
@@ -235,7 +235,7 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 	var stats *service.UsageStats
 	var err error
 	if apiKeyID > 0 {
-		stats, err = h.usageService.GetStatsByAPIKey(c.Request.Context(), apiKeyID, startTime, endTime)
+		stats, err = h.usageService.GetStatsByApiKey(c.Request.Context(), apiKeyID, startTime, endTime)
 	} else {
 		stats, err = h.usageService.GetStatsByUser(c.Request.Context(), subject.UserID, startTime, endTime)
 	}
@@ -346,49 +346,49 @@ func (h *UsageHandler) DashboardModels(c *gin.Context) {
 	})
 }
 
-// BatchAPIKeysUsageRequest represents the request for batch API keys usage
-type BatchAPIKeysUsageRequest struct {
-	APIKeyIDs []int64 `json:"api_key_ids" binding:"required"`
+// BatchApiKeysUsageRequest represents the request for batch API keys usage
+type BatchApiKeysUsageRequest struct {
+	ApiKeyIDs []int64 `json:"api_key_ids" binding:"required"`
 }
 
-// DashboardAPIKeysUsage handles getting usage stats for user's own API keys
+// DashboardApiKeysUsage handles getting usage stats for user's own API keys
 // POST /api/v1/usage/dashboard/api-keys-usage
-func (h *UsageHandler) DashboardAPIKeysUsage(c *gin.Context) {
+func (h *UsageHandler) DashboardApiKeysUsage(c *gin.Context) {
 	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
 		response.Unauthorized(c, "User not authenticated")
 		return
 	}
 
-	var req BatchAPIKeysUsageRequest
+	var req BatchApiKeysUsageRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
 		response.BadRequest(c, "Invalid request: "+err.Error())
 		return
 	}
 
-	if len(req.APIKeyIDs) == 0 {
+	if len(req.ApiKeyIDs) == 0 {
 		response.Success(c, gin.H{"stats": map[string]any{}})
 		return
 	}
 
 	// Limit the number of API key IDs to prevent SQL parameter overflow
-	if len(req.APIKeyIDs) > 100 {
+	if len(req.ApiKeyIDs) > 100 {
 		response.BadRequest(c, "Too many API key IDs (maximum 100 allowed)")
 		return
 	}
 
-	validAPIKeyIDs, err := h.apiKeyService.VerifyOwnership(c.Request.Context(), subject.UserID, req.APIKeyIDs)
+	validApiKeyIDs, err := h.apiKeyService.VerifyOwnership(c.Request.Context(), subject.UserID, req.ApiKeyIDs)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}
 
-	if len(validAPIKeyIDs) == 0 {
+	if len(validApiKeyIDs) == 0 {
 		response.Success(c, gin.H{"stats": map[string]any{}})
 		return
 	}
 
-	stats, err := h.usageService.GetBatchAPIKeyUsageStats(c.Request.Context(), validAPIKeyIDs)
+	stats, err := h.usageService.GetBatchApiKeyUsageStats(c.Request.Context(), validApiKeyIDs)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return

backend/internal/handler/wire.go

@@ -10,7 +10,6 @@ import (
 // ProvideAdminHandlers creates the AdminHandlers struct
 func ProvideAdminHandlers(
 	dashboardHandler *admin.DashboardHandler,
-	opsHandler *admin.OpsHandler,
 	userHandler *admin.UserHandler,
 	groupHandler *admin.GroupHandler,
 	accountHandler *admin.AccountHandler,
@@ -28,7 +27,6 @@ func ProvideAdminHandlers(
 ) *AdminHandlers {
 	return &AdminHandlers{
 		Dashboard:        dashboardHandler,
-		Ops:              opsHandler,
 		User:             userHandler,
 		Group:            groupHandler,
 		Account:          accountHandler,
@@ -98,7 +96,6 @@ var ProviderSet = wire.NewSet(
 
 	// Admin handlers
 	admin.NewDashboardHandler,
-	admin.NewOpsHandler,
 	admin.NewUserHandler,
 	admin.NewGroupHandler,
 	admin.NewAccountHandler,