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- BatchUpdateCredentials 返回 success/failed/results 及 success_ids/failed_ids

- billing jitteredTTL 改为只减不增，确保TTL不超上界

- crypto/rand 失败时随机ID降级避免 panic

- OpenAI SelectAccount 失败日志去重并补充字段

- 修复两处类型断言以通过 errcheck

- config.go: 保留 Sora 配置，合入 SubscriptionCache 配置
- useModelWhitelist.ts: 同时保留 soraModels 和 antigravityModels
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- handleUpstreamError 补齐新增的三个参数 (0, "", false)
- handleStreamingResponse 移除已删除的 nil 参数
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

基于 backend-code-audit 审计报告，修复剩余 P0/P1/P2 共 34 项问题：

P0 生产 Bug：
- 修复 time.Since(time.Now()) 计时逻辑错误 (P0-03)
- generateRandomID 改用 crypto/rand 替代固定索引 (P0-04)
- IncrementQuotaUsed 重写为 Ent 原子操作消除 TOCTOU 竞态 (P0-05)

安全加固：
- gateway/openai handler 错误响应替换为泛化消息，防止内部信息泄露 (P1-14)
- usage_log_repo dateFormat 参数改用白名单映射，防止 SQL 注入 (P1-16)
- 默认配置安全加固：sslmode=prefer、response_headers=true、mode=release (P1-18/19, P2-15)

性能优化：
- gateway handler 循环内 defer 替换为显式 releaseWait 闭包 (P1-02)
- group_repo/promo_code_repo Count 前 Clone 查询避免状态污染 (P1-03)
- usage_log_repo 四个查询添加 LIMIT 10000 防止 OOM (P1-07)
- GetBatchUsageStats 添加时间范围参数，默认最近 30 天 (P1-10)
- ip.go CIDR 预编译为包级变量 (P1-11)
- BatchUpdateCredentials 重构为先验证后更新 (P1-13)

缓存一致性：
- billing_cache 添加 jitteredTTL 防止缓存雪崩 (P2-10)
- DeductUserBalance/UpdateSubscriptionUsage 错误传播修复 (P2-12)
- UserService.UpdateBalance 成功后异步失效 billingCache (P2-13)

代码质量：
- search 截断改为按 rune 处理，支持多字节字符 (P2-01)
- TLS Handshake 改为 HandshakeContext 支持 context 取消 (P2-07)
- CORS 预检添加 Access-Control-Max-Age: 86400 (P2-16)

测试覆盖：
- 新增 user_service_test.go（UpdateBalance 缓存失效 6 个用例）
- 新增 batch_update_credentials_test.go（fail-fast + 类型验证 7 个用例）
- 新增 response_transformer_test.go、ip_test.go、usage_log_repo_unit_test.go、search_truncate_test.go
- 集成测试：IncrementQuotaUsed 并发测试、billing_cache 错误传播测试
- config_test.go 补充 server.mode/sslmode 默认值断言
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

oauth 和 openai 包的 SessionStore.Stop() 直接调用 close(stopCh)，
重复调用会导致 panic。使用 sync.Once 包裹确保幂等安全。

新增单元测试覆盖连续调用和 50 goroutine 并发调用场景。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ForgotPassword 原来从 c.Request.Host 构建重置链接基础 URL，攻击者
可伪造 Host 头将重置链接指向恶意域名窃取 token。

修复方案：
- ServerConfig 新增 frontend_url 配置项
- auth_handler 改为从配置读取前端 URL，未配置时拒绝请求
- Validate() 校验 frontend_url 必须为绝对 HTTP(S) URL
- 新增 TestValidateServerFrontendURL 单元测试
- config.example.yaml 添加配置说明
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- avoid panic by using safe UUID prefix truncation in Gemini digest fallback logs\n- remove unconditional Antigravity 429 full-body debug logs and honor log truncation config\n- align Antigravity quick preset mappings to opus 4.6-thinking targets only\n- restore scope rate-limit aggregation/output in ops availability stats

SSE 热路径中 replaceModelInSSELine 和 replaceModelInResponseBody 原来
使用 json.Unmarshal/Marshal 对每个事件做全量反序列化再序列化，现改为
gjson.Get/sjson.Set 精确字段操作，消除 O(n) 中间 map 分配，保持 JSON
字段顺序不变。涉及 OpenAIGatewayService 和 GatewayService 两个服务。

新增 23 个单元测试覆盖：顶层/嵌套 model 替换、不匹配跳过、空行/[DONE]/
非法 JSON 等边界情况。

Fixes: P1-08
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

feat(antigravity): comprehensive enhancements - model mapping, rate limiting, scheduling & ops

管理员改密后旧JWT会被拒绝，并补充单元测试覆盖。

1. Frontend: replace hardcoded antigravityDefaultMappings with async
   fetch from GET /admin/accounts/antigravity/default-model-mapping,
   eliminating the duplicate data source that caused frontend/backend
   mapping inconsistency.

2. Backend: convert handleSmartRetry and antigravityRetryLoop from
   standalone functions to AntigravityGatewayService methods, enabling
   Redis cache sync (updateAccountModelRateLimitInCache) after both
   rate-limit write paths — long-delay branch and retry-exhausted branch.

Remove extra blank line that caused golangci-lint gofmt check to fail.

- 为 GetActiveSubscription 添加 ristretto L1 缓存 + singleflight 防击穿
- 合并 ValidateSubscription + CheckUsageLimits 为纯内存 ValidateAndCheckLimits
- 窗口维护操作（激活/重置）异步化，不再阻塞首字节
- 缓存返回浅拷贝，避免并发 data race 和缓存污染
- 所有管理操作（分配/续期/撤销/扩展/窗口重置）同步失效 L1 缓存
- 新增 SubscriptionCacheConfig 可配置 L1 缓存大小/TTL/抖动
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Add GetAccessToken upstream branch tests (success/failure/empty/nil)
- Add mapAntigravityModel wildcard-target-equals-request edge case tests
- Add upstream account smart retry test case
- Add GeminiMessagesCompatService custom model_mapping and empty model tests

- GetAccessToken: add upstream branch to read api_key from credentials
- shouldTriggerAntigravitySmartRetry: relax check from IsOAuth to Platform-based
- isModelSupportedByAccount/WithContext: replace IsAntigravityModelSupported
  whitelist with mapAntigravityModel for unified scheduling/forwarding logic
- mapAntigravityModel: fix edge case where wildcard target equals request model
- Update tests for new behavior and add custom model_mapping test cases

Key changes:
- Upgrade model mapping: Opus 4.5 → Opus 4.6-thinking with precise matching
- Unified rate limiting: scope-level → model-level with Redis snapshot sync
- Load-balanced scheduling by call count with smart retry mechanism
- Force cache billing support
- Model identity injection in prompts with leak prevention
- Thinking mode auto-handling (max_tokens/budget_tokens fix)
- Frontend: whitelist mode toggle, model mapping validation, status indicators
- Gemini session fallback with Redis Trie O(L) matching
- Ops: enhanced concurrency monitoring, account availability, retry logic
- Migration scripts: 049-051 for model mapping unification

feat(frontend): show seconds in rate limit time display

fix(antigravity): reduce 429 fallback cooldown from 5min to 30s

fix(antigravity): auto-fix max_tokens <= budget_tokens causing 400 error

chore: add .gitattributes to enforce LF line endings

Change formatTime() to include seconds (HH:MM:SS) instead of only
hours and minutes (HH:MM). This gives users more precise information
about when rate limits will reset.

The default fallback cooldown when rate limit reset time cannot be
parsed was 5 minutes, which is too aggressive and causes accounts
to be unnecessarily locked out. Reduce to 30 seconds for faster
recovery. Config override still works (unit remains minutes).

When extended thinking is enabled, Claude API requires max_tokens >
thinking.budget_tokens. If misconfigured, this auto-adjusts max_tokens
to budget_tokens + 1000 instead of returning a 400 error.

- Add ensureMaxTokensGreaterThanBudget helper function
- Extract Gemini25FlashThinkingBudgetLimit constant (24576)
- Log adjustment for debugging

Ensures consistent line endings for SQL migration files, Go source,
shell scripts, YAML configs, and Dockerfiles. Fixes checksum mismatches
on Windows where CRLF line endings cause migration hash differences.

- OAuth 账号：使用完整的 DefaultBetaHeader 和 Claude Code 客户端 headers
- API Key 账号：使用 APIKeyBetaHeader（不含 oauth beta）