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Upstream proxies (account 4, 112) return `"<nil>"` as the error.type in
their JSON responses — a Go fmt.Sprintf("%v", nil) artifact. Since
`normalizeOpsErrorType` only checked for empty string, the literal
"<nil>" passed through and poisoned the entire classification chain:
error_phase was misclassified as "internal" (instead of "request"),
severity was inflated to P2, and the stored error_type was meaningless.

Add `isKnownOpsErrorType` whitelist so any unrecognised type falls
through to the code-based or default "api_error" classification.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Remove Gemini platform exclusion from model restriction UI in
  Create/Edit account modals (Gemini now supports model_mapping)
- Remove outdated Gemini model passthrough info cards
- Add model_mapping field to GeminiCredentials type
- Extend warmup request interception toggle to Antigravity platform
- Remove redundant try/catch in API key account creation
- Remove noisy gateway.request_completed debug log
- Reorganize Gemini model mapping sections in constants.go

Add comprehensive tests for warmup request interception behavior
covering Antigravity accounts with various credential configurations.

- Extract duplicated failover logic from gateway_handler.go (3 places)
  and gemini_v1beta_handler.go into shared failover_loop.go
- Introduce FailoverState with HandleFailoverError and HandleSelectionExhausted
- Move helper functions (needForceCacheBilling, sleepWithContext) into failover_loop.go
- Add comprehensive unit tests (32+ test cases)
- Delete redundant gateway_handler_single_account_retry_test.go

Add a dedicated CheckMixedChannel endpoint that allows the frontend
to pre-validate mixed channel risk before submitting create/update
requests. This improves UX by showing warnings earlier in the flow
instead of only after form submission.

Backend changes:
- Add CheckMixedChannelRequest struct and CheckMixedChannel handler
- Register POST /check-mixed-channel route
- Expose CheckMixedChannelRisk as public method on AdminService
- Simplify Create/Update 409 responses (remove details/require_confirmation)
- Add comprehensive handler tests and stub methods

Frontend changes:
- Add checkMixedChannelRisk API function and TypeScript types
- Refactor CreateAccountModal to precheck before step transition and submission
- Refactor EditAccountModal to precheck before update submission
- Replace pendingPayload pattern with action-based dialog flow

- 新增 UsageRecordWorkerPool，支持有界队列、溢出降级策略与自动扩缩容
- 将 Gateway/OpenAI/Sora/Gemini 使用量记录改为提交到统一任务池执行
- 增加 usage_record 配置默认值与校验规则，并补充配置与任务提交相关测试
- 注入并托管 worker 池生命周期，服务退出时统一 StopAndWait
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 在 CreateAccountModal 为 Anthropic API Key 增加自动透传开关

- 创建请求写入 extra.anthropic_passthrough 并补充状态重置

- 新增 AccountHandler 单测，验证 extra 字段从请求到 CreateAccountInput 的透传

- 在 failover 场景透传上游响应头并识别 Cloudflare challenge/cf-ray

- 统一 Sora 任务请求的 UA 与代理使用，sentinel 与业务请求保持一致

- 修复流式错误事件 JSON 转义问题并补充相关单元测试

- 将 refresh_token 恢复请求改为表单编码并匹配 OAuth 约定
- 流式错误改为 JSON 序列化，避免消息含引号或换行导致 SSE 非法
- 补充 Sora token 恢复与 failover 流式错误透传回归测试
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 新增并接通 Sora 专用 OAuth 接口与 ST/RT 换取能力
- 完成前端 Sora 授权、RT/ST 手动导入与账号创建流程
- 强化 Sora token 恢复、转发日志与网关路由隔离行为
- 补充后端服务层与路由层相关测试覆盖
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Account-level cache TTL override: rewrite Anthropic cache_creation
  token classification (5m↔

1h) in streaming/non-streaming responses
- New DB field cache_ttl_overridden in usage_log for billing tracking
- Migration 055_add_cache_ttl_overridden
- Frontend: CacheTTL override toggle in account create/edit modals
- Ent schema regenerated for new usage_log fields
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 前端自动刷新改为 ETag/304 增量合并，减少全量重刷

- 单账号更新后增加静默窗口，避免刚更新即被自动刷新覆盖

- 列表筛选移除时改为待同步提示，不再立即触发全量补页

- 后端账号列表支持 If-None-Match，命中返回 304

- 单账号接口统一补充运行时容量字段并暴露 ETag 头

- 将编辑与重新授权成功事件改为回传更新后的账号对象
- 在账号列表页按 id 就地补丁更新单行数据并保留运行时容量字段
- 单账号操作（刷新凭证/清错/清限流/临时不可调度重置）改为单行更新
- 后端增强 clear-rate-limit 接口，返回更新后的账号对象
- 同步前端 clearRateLimit API 类型定义
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 将高密度服务与处理器日志迁移到新日志系统（LegacyPrintf/结构化日志）
- 增加 stdlog bridge 与兼容测试，保留旧日志捕获能力
- 将 OpenAI 断流告警改为结构化 Warn 并改造对应测试为 sink 捕获
- 补齐后端相关文件 logger 引用并通过全量 go test

- 移除 OpenAIGatewayHandler 未使用字段

- 删除并发缓存中未使用的 Redis 脚本常量

- 将仅供 unit 测试使用的 parseIntegralNumber 移入 unit build tag 文件

- 新增管理端接口 /api/v1/admin/ops/dashboard/openai-token-stats，按模型聚合统计 gpt% 请求

- 支持 time_range=30m|1h|1d|15d|30d（默认 30d），支持 platform/group_id 过滤

- 支持分页（page/page_size）或 TopN（top_n）互斥查询

- 前端运维监控页新增统计表卡片，包含空态/错误态与分页/TopN 交互

- 补齐后端与前端测试

- OpenAI OAuth/API Key 统一支持自动透传开关，编辑页可开关\n- 透传模式仅替换认证并保留计费/并发/审计，修复 API Key responses 端点拼接\n- Usage 页面显示原始 User-Agent 且不截断，补充回归测试与清单

- 优化 /v1/responses 热路径，减少重复解析与不必要拷贝\n- 优化并发与 token 竞争路径并补齐运行指标\n- 补充 OpenAI/Ops 相关单元测试与回归用例\n- 新增灰度阈值守护与压测脚本，支撑发布验收

- Add groupID parameter to ListAccounts and ListWithFilters methods
- Implement account filtering by group ID in repository query
- Add group query parameter parsing in account handler
- Update all ListAccounts/ListWithFilters call sites with groupID parameter
- Add group filter UI component to AccountTableFilters
- Add i18n translations for group filter label in English and Chinese
- Update API contract and test stubs to reflect new signature
- Enable filtering accounts by their assigned groups in admin panel

- Add used_by_email column to redeem code export CSV for better user identification
- Implement rate_limited status filter in account listing with RateLimitResetAt check
- Extend redeem code search to include user email in addition to code matching
- Add API key search capability to user listing filters
- Display user email in redeem code table used_by column for improved visibility
- Update search placeholders in UI to reflect expanded search capabilities (email, username, notes, API key)
- Improve Chinese and English localization strings for search hints

后端新增 ValidateRefreshToken service 方法和 POST /oauth/refresh-token 端点，
前端新增 API/Composable/UI 集成，OAuthAuthorizationFlow i18n 动态化，
支持在 Antigravity 创建账号时批量粘贴 Refresh Token 自动验证并创建账号。

- ops_error_logger: status < 400 分支增加 OpsSkipPassthroughKey 检查
- ops_upstream_context: 新增 checkSkipMonitoringForUpstreamEvent，中间重试/故障转移事件也能触发跳过标记
- gateway_handler/openai_gateway_handler/gemini_v1beta_handler: handleFailoverExhausted 匹配规则后设置 OpsSkipPassthroughKey
- antigravity_gateway_service: writeMappedClaudeError 增加 applyErrorPassthroughRule 调用