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Add a dedicated modal in group management for viewing, adding, editing,
and deleting per-user rate multipliers within a group.

Backend:
- GET /admin/groups/:id/rate-multipliers - list entries with user details
- PUT /admin/groups/:id/rate-multipliers - batch sync (full replace)
- DELETE /admin/groups/:id/rate-multipliers - clear all entries
- Repository: GetByGroupID, SyncGroupRateMultipliers methods on
  user_group_rate_multipliers table (same table as user-side rates)

Frontend:
- New GroupRateMultipliersModal component with:
  - User search and add with email autocomplete
  - Editable rate column with local edit mode (cancel/save)
  - Batch adjust: multiply all rates by a factor
  - Clear all (local operation, requires save to persist)
  - Pagination (10/20/50 per page)
  - Platform icon with brand colors in group info bar
  - Unsaved changes indicator with revert option
- Unit tests for all three backend endpoints

将 /v1/chat/completions 端点从 ResponseWriter 劫持模式重构为独立的
类型安全转换路径，与 Anthropic Messages 端点架构对齐：

- 在 apicompat 包新增 Chat Completions 完整类型定义和双向转换器
- 新增 ForwardAsChatCompletions service 方法，走 Responses API 上游
- Handler 改为独立的账号选择/failover 循环，不再劫持 Responses handler
- 提取 handleCompatErrorResponse 为 Chat Completions 和 Messages 共用
- 删除旧的 forwardChatCompletions 直传路径及相关死代码

Anthropic Messages API 的流式转发路径（gateway_service.go）在上游长时间
无数据时（如 Opus extended thinking 阶段）不会向下游发送任何内容，导致
Cloudflare Tunnel 等代理因连接空闲而断开。

复用已有的 StreamKeepaliveInterval 配置（默认 10 秒），在 select 循环中
添加 keepalive 分支，定时发送 Anthropic 原生格式的 ping 事件保活，与
OpenAI 兼容路径的实现模式保持一致。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1. 修复 WriteFilteredHeaders API 不兼容（2处）:
   将 s.cfg.Security.ResponseHeaders 改为 s.responseHeaderFilter，
   因为 main 分支已将函数签名改为接受 *responseheaders.CompiledHeaderFilter

2. 修复 writer 生命周期导致的 nil pointer panic:
   ChatCompletions handler 替换了 c.Writer 但未恢复，导致
   OpsErrorLogger 中间件的 defer 释放 opsCaptureWriter 后，
   Logger 中间件调用 c.Writer.Status() 触发空指针解引用。
   通过保存并恢复 originalWriter 修复。

3. 为 chatCompletionsResponseWriter 添加防御性 Status() 和
   Written() 方法，包含 nil 安全检查

4. 恢复 gateway.go 中被误删的 net/http import

基于 @yulate 在 PR #648 (commit 0bb6a392) 的工作，解决了与最新
main 分支的合并冲突。

原始功能（@yulate）:
- 添加 /v1/chat/completions 和 /chat/completions 兼容端点
- 将 Chat Completions 请求转换为 Responses API 格式并转换回来
- 添加 API Key 直连转发支持
- 包含单元测试
Co-authored-by: yulate <yulate@users.noreply.github.com>

The ChatGPT backend-api codex/responses endpoint requires `input` to be
an array, but the OpenAI Responses API spec allows it to be a plain string.
When a client sends a string input, sub2api now converts it to the expected
message array format. Empty/whitespace-only strings become an empty array
to avoid triggering a 400 "Input must be a list" error.

新增以下运维告警指标类型:
- group_available_accounts: 组内可用账户数
- group_available_ratio: 组内可用账户比例
- group_rate_limit_ratio: 组内限速账户比例
- account_rate_limited_count: 限速账户数
- account_error_count: 错误账户数
- account_error_ratio: 错误账户比例
- overload_account_count: 过载账户数

包含比例和计数类指标的评估逻辑，并注册新的百分比类指标用于阈值校验。

- Add AdminResetQuota service method to reset daily/weekly usage windows
- Add POST /api/v1/admin/subscriptions/:id/reset-quota handler and route
- Add resetQuota API function in frontend subscriptions client
- Add reset quota button, confirmation dialog, and handlers in SubscriptionsView
- Add i18n keys for reset quota feature in zh and en locales
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1. 识别OpenAI "An error occurred while processing your request" 临时性400错误
   并触发failover，同时在池模式下标记RetryableOnSameAccount，允许同账号重试
2. ForwardAsAnthropic路径同步支持临时性400错误的识别和同账号重试
3. HelpTooltip组件使用Teleport渲染到body，修复在dialog内被裁切的问题

Two SSE scanners in openai_gateway_messages.go were hardcoded to 1MB
while all other scanners use defaultMaxLineSize (500MB) with config
override. This caused Responses API streams to fail on large payloads.

之前管理员无法通过 API 密钥管理将用户绑定到订阅类型分组（直接返回错误）。
现在改为检查用户是否持有该分组的有效订阅，有则允许绑定，无则拒绝。

- admin_service: 新增 userSubRepo 依赖，替换硬拒绝为订阅校验
- admin_service: 区分 ErrSubscriptionNotFound 和内部错误，避免 DB 故障被误报
- wire_gen/api_contract_test: 同步新增参数
- UserApiKeysModal: 管理员分组下拉不再过滤订阅类型分组
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

OAuth 授权和 token 刷新时从 id_token 的 OpenAI auth claim 中
提取 chatgpt_plan_type（plus/team/pro/free），存入 credentials，
账号管理页面 PlatformTypeBadge 显示订阅类型。

When the service restarts, concurrency slots from the old process
remain in Redis, causing phantom occupancy. On startup, scan all
concurrency sorted sets and remove members with non-current process
prefix, then clear orphaned wait queue counters.

Uses Go-side SCAN to discover keys (compatible with Redis client
prefix hooks in tests), then passes them to a Lua script for
atomic member-level cleanup.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 打通 service_tier 在 OpenAI HTTP、WS、passthrough 与 usage 记录中的传递
- 修正 priority/flex 计费逻辑，并将 fast 归一化为 priority
- 在用户端和管理端补齐服务档位与计费明细展示
- 补齐前后端测试，并修复 WS 限流信号重复持久化导致的全量回归失败
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

4K image base64 data can exceed 40MB limit, causing "bufio.Scanner:
token too long" errors. Scanner is adaptive (starts at 64KB, grows
as needed), so increasing the cap has no impact on normal responses.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

- 为定时测试计划增加 auto_recover 配置，补齐前后端类型、接口、仓储与数据库迁移
- 在定时测试成功后自动恢复账号 error、rate-limit 等可恢复运行时状态
- 新增 /admin/accounts/:id/recover-state 接口，合并原有重置状态与清限流操作
- 更新账号管理菜单与定时测试面板，补充自动恢复开关、说明提示和状态展示
- 补充账号恢复、限流清理与仓储同步相关测试