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正常终端事件（response.completed 等）退出后连接归还复用，
仅异常路径（读写错误、error 事件、客户端断连）MarkBroken 销毁。

Generate 模式:
- 引入 cleanExit 标记，仅在 isTerminalEvent break 时设置 true
- defer 中根据 cleanExit 决定是否 MarkBroken
- 所有异常路径已在各自分支中提前调用 MarkBroken

Ingress 模式:
- 引入 lastTurnClean 标记，sendAndRelay 正常完成时设为 true
- releaseSessionLease 根据 lastTurnClean 决定是否 MarkBroken
- 错误路径重置 lastTurnClean = false
- 客户端断连后 drain 仍保守 MarkBroken（L2916）

根因：多个用户共享同一 OAuth 账号时，conversation_id/session_id 头
未做用户隔离，导致上游 chatgpt.com 将不同用户的请求关联到同一会话。

HTTP SSE 修复:
- 新增 isolateOpenAISessionID(apiKeyID, raw)，将 API Key ID 混入
  session 标识符（xxhash），确保不同 Key 的用户产生不同上游会话
- buildUpstreamRequest: OAuth 分支先 Del 客户端透传的 session 头，
  再用隔离值覆盖
- buildUpstreamRequestOpenAIPassthrough: 透传路径同样隔离
- ForwardAsAnthropic: Anthropic Messages 兼容路径同步修复
- buildOpenAIWSHeaders: WS 路径的 OAuth session 头同步隔离

feat: Antigravity AI Credits overages handling & balance display

fix(admin): polish spending ranking and usage defaults

fix: record endpoint info for all API surfaces & unify normalization via middleware

feat: unified OAuth token refresh API with distributed locking

- Fix gofmt alignment in admin_service.go and trailing newline in
  antigravity_credits_overages.go
- Suppress errcheck for fmt.Sscanf in client.go GetMinimumAmount

Remove SimulateClaudeMaxEnabled field and related logic from
admin_service.go, and remove applyClaudeMaxCacheBillingPolicyToUsage,
applyClaudeMaxNonStreamingRewrite, setupClaudeMaxStreamingHook calls
from antigravity_gateway_service.go. These symbols are not yet
available in upstream/main.

Replace process-memory sync.Map + per-model runtime state with a single
"AICredits" key in model_rate_limits, making credits exhaustion fully
isomorphic with model-level rate limiting.

Scheduler: rate-limited accounts with overages enabled + credits available
are now scheduled instead of excluded.

Forwarding: when model is rate-limited + credits available, inject credits
proactively without waiting for a 429 round trip.

Storage: credits exhaustion stored as model_rate_limits["AICredits"] with
5h duration, reusing SetModelRateLimit/isRateLimitActiveForKey.

Frontend: show credits_active (yellow ⚡) when model rate-limited but
credits available, credits_exhausted (red) when AICredits key active.

Tests: add unit tests for shouldMarkCreditsExhausted, injectEnabledCreditTypes,
clearCreditsExhausted, and update existing overages tests.

feat: implement resolveCreditsOveragesModelKey function to stabilize model key resolution for credit overages

Introduce OAuthRefreshAPI as the single entry point for all OAuth token
refresh operations, eliminating the race condition where background
refresh and inline refresh could simultaneously use the same
refresh_token (fixes #1035).

Key changes:
- Add OAuthRefreshExecutor interface extending TokenRefresher with CacheKey
- Add OAuthRefreshAPI.RefreshIfNeeded with lock → DB re-read → double-check flow
- Add ProviderRefreshPolicy / BackgroundRefreshPolicy strategy types
- Simplify all 4 TokenProviders to delegate to OAuthRefreshAPI
- Rewrite TokenRefreshService.refreshWithRetry to use unified API path
- Add MergeCredentials and BuildClaudeAccountCredentials helpers
- Add 40 unit tests covering all new and modified code paths

- Apply InboundEndpointMiddleware to all gateway route groups
- Replace normalizedOpenAIInboundEndpoint/normalizedOpenAIUpstreamEndpoint and normalizedGatewayInboundEndpoint/normalizedGatewayUpstreamEndpoint with GetInboundEndpoint/GetUpstreamEndpoint
- Remove 4 old constants and 4 old normalization functions (-70 lines)
- Migrate existing endpoint normalization test to new API

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode

)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Introduce endpoint.go with shared constants, NormalizeInboundEndpoint, DeriveUpstreamEndpoint, InboundEndpointMiddleware, and context helpers. This replaces the two separate normalization implementations (OpenAI and Gateway) with a single source of truth. Includes comprehensive test coverage.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode

)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Extend RecordUsageInput and RecordUsageLongContextInput structs with InboundEndpoint and UpstreamEndpoint so that Claude, Gemini, and Sora handlers can record endpoint info alongside OpenAI handlers.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode

)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Replace t.Add(24*time.Hour - time.Nanosecond) with t.AddDate(0, 0, 1) and use SQL < instead of <= for end-of-day boundaries. This avoids edge-case misses around DST transitions.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode

)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

feat(ops): add ignore insufficient balance errors toggle and extract error constants

fix: 修复多个issues - Gemini schema 兼容性、批量编辑白名单、Docker 工具支持和限额字段处理Fix/open issues cleanup

The upstream Gemini API returns "Insufficient account balance" which
doesn't contain the substring "insufficient balance". Add explicit
match for the full phrase to ensure the filter works correctly.

commit 0debe0a8 在修复 OpenAI WS 用量窗口刷新问题时，意外删除了
UsageProgressBar 中的 window stats 渲染逻辑和格式化函数。

恢复进度条上方的统计行（requests, tokens, account cost, user cost）
及对应的 4 个格式化 computed 属性。

修复批量编辑账号时，UI 显示的是 plain 模型名（如 GPT-5），但实际落库的是 dated 模型名的问题。

核心改动：
1. 批量编辑白名单不再使用 BulkEditAccountModal.vue 中手写的过期模型列表
   - 移除了 allModels 和 presetMappings 的硬编码列表（共 200+ 行）
   - 直接复用 ModelWhitelistSelector.vue 组件

2. ModelWhitelistSelector 组件支持多平台联合过滤
   - 新增 platforms 属性支持传入多个平台
   - 添加 normalizedPlatforms 计算属性统一处理单平台和多平台场景
   - availableOptions 根据选中的多个平台动态联合过滤模型列表
   - fillRelated 功能支持一次性填充多个平台的相关模型

3. 模型映射预设改为动态生成
   - filteredPresets 改用 getPresetMappingsByPlatform 从统一模型源按平台动态生成
   - 不再依赖弹窗中的手写预设列表

现在的行为：
- UI 显示什么模型，勾选什么模型，传给后端的就是什么模型
- 彻底解决了批量编辑链路上"显示与实际不一致"的问题
- 模型列表和映射预设始终与系统定义保持同步

为了支持容器内的数据库备份和恢复功能，在运行时镜像中添加 PostgreSQL 客户端工具。

变更内容：
- 使用多阶段构建从 postgres:18-alpine 镜像复制 pg_dump 和 psql 二进制文件
- 添加必要的依赖库（libpq, zstd-libs, lz4-libs, krb5-libs, libldap, libedit）
- 升级基础镜像到 alpine:3.21
- 复制 libpq.so.5 共享库以确保工具正常运行

这样可以在运行时容器中直接执行数据库备份和恢复操作，无需访问 Docker socket。

修复在填写限额时，如果不填写完整的三个限额额度（日限额、周限额、月限额）就会报错的问题。

变更内容：
- 后端：添加 optionalLimitField 类型处理空值和空字符串，兼容部分限额字段为空的情况
- 前端：添加 normalizeOptionalLimit 函数规范化限额输入，将空值、空字符串和无效数字统一处理为 null

Remove misleading "upstream" wording - the error is about client API key
user balance, not upstream account balance.

- Add 5th error filter switch IgnoreInsufficientBalanceErrors to suppress
  upstream insufficient balance / insufficient_quota errors from ops log
- Extract hardcoded error strings into package-level constants for
  shouldSkipOpsErrorLog, normalizeOpsErrorType, classifyOpsPhase, and
  classifyOpsIsBusinessLimited
- Define ErrNoAvailableAccounts sentinel error and replace all
  errors.New("no available accounts") call sites
- Update tests to use require.ErrorIs with the sentinel error

fix: extract and log Claude output_config.effort in usage records

feat: add endpoint metadata and usage endpoint distribution insights

fix(billing): treat nil rate limit window as expired to prevent usage accumulation

fix(billing): allow clearing group quota limits and treat 0 as zero-limit

fix(gateway): 防止流式 failover 拼接腐化导致客户端收到双 message_start fix issue #991

fix: Bedrock 账户配额限制不生效