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Replace direct row rendering with @tanstack/vue-virtual. The table
now only renders visible rows (~20) via padding <tr> placeholders,
eliminating the rendering bottleneck when displaying 100+ rows with
heavy cell components.

Key changes:
- DataTable.vue: integrate useVirtualizer (always-on), virtual row
  template with measureElement for variable row heights, defineExpose
  virtualizer/sortedData for external access, overflow-y/flex CSS
- useSwipeSelect.ts: dual-mode support via optional
  SwipeSelectVirtualContext — data-driven row index lookup and
  selection range when virtualizer is present, original DOM-based
  path preserved for callers that don't pass virtualContext

Move 529 overload cooldown configuration from config file to admin
settings UI. Adds an enable/disable toggle and configurable cooldown
duration (1-120 min) under /admin/settings gateway tab, stored as
JSON in the settings table.

When disabled, 529 errors are logged but accounts are no longer
paused from scheduling. Falls back to config file value when DB
is unreachable or settingService is nil.

后端 HTML 注入时同步替换 <title> 标签为自定义站点名称，
前端 fetchPublicSettings 完成后重新设置 document.title，
解决路由守卫先于设置加载导致标题回退为默认值的时序问题。

在订阅管理页面工具栏添加教程指南按钮（? 图标），点击弹出模态框，
引导管理员完成订阅功能的完整使用流程：

- 步骤一：创建订阅分组（含跳转分组管理链接）
- 步骤二：分配订阅给用户（搜索用户、选择分组、设置有效期）
- 步骤三：管理已有订阅（调整/重置配额/撤销操作说明表格）
- 底部提示：说明下拉列表为空时的解决方案

弹窗样式参照 BackupView 的 R2 Guide 模态框实现，保持 UI 一致性。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

在 en.ts 中为订阅管理页面新增 guide 相关翻译词条，
与中文翻译保持结构一致，支持中英文切换。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

在 zh.ts 中为订阅管理页面新增 guide 相关翻译词条，包括：
- 教程弹窗标题与副标题
- 三步操作引导文案（创建分组、分配订阅、管理订阅）
- 操作说明表格（调整/重置配额/撤销）
- 底部提示信息
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

复用 GroupCapacityService，在 admin 分组列表中添加容量列，
显示每个分组的实时并发/会话/RPM 使用量和上限。
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

分组管理列表增强：

1. 今日/累计用量列：
   - 新增独立端点 GET /admin/groups/usage-summary
   - 一次查询返回所有分组的今日费用和累计费用（actual_cost）
   - 前端异步加载后合并显示在分组列表中

2. 账号数区分可用/限流/总量：
   - 将账号数列从单一总量改为 badge 内多行展示
   - 可用: active + schedulable 的账号数（绿色）
   - 限流: rate_limit/overload/temp_unschedulable 的账号数（橙色，无限流时隐藏）
   - 总量: 全部关联账号数
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Add a platform filter dropdown to the admin subscriptions view, allowing
filtering subscriptions by platform (Anthropic, OpenAI, Gemini, etc.)
through the group association.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Show upstream model mapping (requested -> upstream) in UsageTable with arrow notation. Add requested/upstream/mapping source toggle to ModelDistributionChart with lazy loading — only fetches data when user switches tab, with per-source cache invalidation on filter changes. Include upstream_model column in Excel export and i18n for en/zh.

Use utilization-based idle detection instead of local request counts so newly imported OAuth accounts keep countdowns when usage is non-zero.

Make setup password requirements consistent with backend rules and show API-provided error messages so install failures are actionable. Trim admin email before validation to avoid false invalid-email rejections from surrounding whitespace.

目前作者已有商业站信息，面向管理可提供赞助渠道，面向普通用户请考虑提供信息隐藏措施

The `pattern="\d+\.\d+\.\d+"` on the min_claude_code_version input caused
the browser's native HTML5 form validation to silently block form submission
when the value was invalid or when the hidden gateway tab was active. This
resulted in no network request being sent when clicking Save on any tab.

Backend already validates semver format and returns a proper 400 error,
so the frontend pattern attribute is redundant.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

- Add compile-time interface assertion for sessionWindowMockRepo
- Fix flaky fallback test by capturing time.Now() before calling UpdateSessionWindow
- Replace stale hardcoded timestamps with dynamic future values
- Add millisecond detection and bounds validation for reset header timestamp
- Use pause/resume pattern for interval in UsageProgressBar to avoid idle timers on large lists
- Fix gofmt comment alignment
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

The expanded user breakdown rows already align with the parent table
columns (Requests, Token, Actual, Standard), so the repeated sub-header
wastes vertical space. Remove the <thead> from UserBreakdownSubTable.

Click on a group name, model name, or endpoint name in the distribution
tables to expand and show per-user usage breakdown (requests, tokens,
actual cost, standard cost).

Backend: new GET /admin/dashboard/user-breakdown API with group_id,
model, endpoint, endpoint_type filters.
Frontend: clickable rows with expand/collapse sub-table in all three
distribution charts.

The 5h window reset time displayed for Setup Token accounts was inaccurate
because UpdateSessionWindow predicted the window end as "current hour + 5h"
instead of reading the actual `anthropic-ratelimit-unified-5h-reset` response
header. This caused the countdown to differ from the official Claude page.

Backend: parse the reset header (Unix timestamp) and use it as the real
window end, falling back to the hour-truncated prediction only when the
header is absent. Also correct stale predictions when a subsequent request
provides the real reset time.

Frontend: add a reactive 60s timer so the reset countdown in
UsageProgressBar ticks down in real-time instead of freezing at the
initial value.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

POST /backups 和 POST /backups/:id/restore 改为异步：立即返回 HTTP 202，
后台 goroutine 独立执行 pg_dump → gzip → S3 上传，前端每 2s 轮询状态。

后端:
- 新增 StartBackup/StartRestore 方法，后台 goroutine 不依赖 HTTP 连接
- Graceful shutdown 等待活跃操作完成，启动时清理孤立 running 记录
- BackupRecord 新增 progress/restore_status 字段支持进度和恢复状态追踪

前端:
- 创建备份/恢复后轮询 GET /backups/:id 直到完成或失败
- 标签页切换暂停/恢复轮询，组件卸载清理定时器
- 正确处理 409（备份进行中）和轮询超时
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

The usage stats query defaults to a 30-day rolling window, but the
UI label said "Total"/"累计" implying lifetime aggregation. Rename
to "Last 30d"/"近30天" so the label matches the actual query semantics.

Closes #1060

- Simplify OpenAI rendering: always fetch /usage, prefer fetched data over
  codex snapshot (snapshot serves as loading placeholder only)
- Remove dead code: preferFetchedOpenAIUsage, isOpenAICodexSnapshotStale,
  and unreachable template branch
- Add today-stats support for key accounts (req/tokens/A/U badges)
- Use formatCompactNumber for consistent number formatting
- Add A/U badge titles for clarity
- Filter zero-value window stats in UsageProgressBar to avoid empty badges
- Update tests to match new fetched-data-first behavior

- Pass todayStats/todayStatsLoading to AccountUsageCell for key accounts
- Propagate usageManualRefreshToken to force usage reload on explicit refresh
- Refresh today stats when toggling usage/today_stats columns visible

- Add formatCompactNumber() for consistent large-number formatting (K/M/B)
- Include last_used_at in OpenAI usage refresh key for better change detection
- Add .gitattributes eol=lf rules for frontend source files

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

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

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