GitLab

- QuotaLimit changed to *int64 (null=unlimited, >0=limited)
- Add reset-usage endpoint (POST /admin/settings/web-search-emulation/reset-usage)
- Show quota usage in header always (collapsed and expanded)
- Add reset quota button in expanded provider view
- Quota input: empty=unlimited with ∞ placeholder, must be >0 if set
- Add email verification hint on balance notify card

- Add "verify" button next to saved unverified emails in
  ProfileBalanceNotifyCard (send code → enter code → verify)
- Backend: VerifyAndAddNotifyEmail now marks existing unverified
  emails as verified instead of returning "already exists"
- Inline verification UI with countdown timer and resend button

- Fix cached balance causing threshold crossing to never trigger:
  read real-time balance from billingCacheService instead of stale
  API key auth snapshot
- Remove email="" placeholder concept; all emails are user-managed
- Only send notifications to verified && non-disabled emails
- Frontend: pre-fill user's email in add input when list is empty
- Remove FilterEnabledEmails/IsPrimaryDisabled helpers (no longer needed)

- Change balance_notify_extra_emails and account_quota_notify_emails
  from []string to []NotifyEmailEntry{email, disabled, verified}
- Add per-email enable/disable toggle for both user and admin notifications
- Add PUT /user/notify-email/toggle API endpoint
- Fix critical bug: API key auth cache snapshot missing balance notify
  fields (Email, Username, BalanceNotifyEnabled, etc.), causing
  notifications to never fire on cached request paths
- Bump cache snapshot version 3→4 to invalidate stale entries
- Add SQL migration 104 to convert old format data
- Backward compatible: parseNotifyEmails auto-detects old/new format
- User balance notify: max 3 emails (primary + 2 extra)
- Admin quota notify: unlimited emails, each with toggle

Replace blur-based auto-save with an explicit Save button so users
know when their threshold is persisted. Shows success toast on save.

- Show system default threshold as placeholder in custom threshold input
- Display user's primary email with "Primary" badge
- Support adding multiple pending emails before verification
- Each pending email has independent send/verify/resend flow
- Expose balance_low_notify_threshold in PublicSettings API
- Clean up timers on unmount to prevent leaks

- Fix GetByKeyForAuth missing user.FieldEmail and user.FieldUsername (notifications sent to empty address)
- Guard against empty email in collectBalanceNotifyRecipients
- Remove non-atomic TotalRecharged read-modify-write in admin balance adjustment
- HTML-escape userName/siteName/accountName in notification email templates
- Fix timer leak in ProfileBalanceNotifyCard (add onUnmounted cleanup)
- Add warning log on websearch proxy URL resolution failure

- User balance low notification: email alert when balance drops below
  configurable threshold (user email + verified extra emails)
- Account quota notification: broadcast email to admin-configured
  recipients when daily/weekly/total quota usage exceeds alert threshold
- Admin settings: global enable/disable, default threshold, quota
  notification email list (Email Settings tab)
- User profile: enable/disable, custom threshold, add/remove extra
  notification emails with verification code flow
- Account quota: per-dimension alert toggle and threshold in quota
  control card
- Trigger logic: first-crossing only (old >= threshold && new < threshold
  for balance; old < threshold && new >= threshold for quota), naturally
  prevents duplicate notifications without Redis dedup

优化 /admin/users 页面的并发数列，显示「当前/最大」格式，
参考 AccountCapacityCell 的设计风格。

- 后端 UserHandler 注入 ConcurrencyService，批量查询用户当前并发数
- 新增 UserConcurrencyCell 组件，支持颜色状态（空闲灰/使用中黄/满载红）
- 前端 AdminUser 类型添加 current_concurrency 字段

用户 Dashboard 的 Token 使用趋势图表现在显示 Input/Output/Cache 三种类型，
并在 Tooltip 中显示 Actual 和 Standard 价格，与管理员页面保持一致。

新增功能：
- 支持 Google Authenticator 等应用进行 TOTP 二次验证
- 用户可在个人设置中启用/禁用 2FA
- 登录时支持 TOTP 验证流程
- 管理后台可全局开关 TOTP 功能

安全增强：
- TOTP 密钥使用 AES-256-GCM 加密存储
- 添加 TOTP_ENCRYPTION_KEY 配置项，必须手动配置才能启用功能
- 防止服务重启导致加密密钥变更使用户无法登录
- 验证失败次数限制，防止暴力破解

配置说明：
- Docker 部署：在 .env 中设置 TOTP_ENCRYPTION_KEY
- 非 Docker 部署：在 config.yaml 中设置 totp.encryption_key
- 生成密钥命令：openssl rand -hex 32

Changed dashboard.addBalance to dashboard.addBalanceWithCode to match the existing translation key in locale files.

- 用户仪表盘 Token 统计卡片支持 K/M 单位自动切换
- 更新 formatTokensK 工具函数支持百万级显示
- 修复 setup.go 中未检查返回值的 errcheck 错误

- 扩展 Icon.vue 组件，新增 60+ 图标路径
  - 导航类: arrowRight, arrowLeft, arrowUp, arrowDown, chevronUp, externalLink
  - 状态类: checkCircle, xCircle, exclamationCircle, exclamationTriangle, infoCircle
  - 用户类: user, userCircle, userPlus, users
  - 文档类: document, clipboard, copy, inbox
  - 操作类: download, upload, filter, sort
  - 安全类: key, lock, shield
  - UI类: menu, calendar, home, terminal, gift, creditCard, mail
  - 数据类: chartBar, trendingUp, database, cube
  - 其他: bolt, sparkles, cloud, server, sun, moon, book 等

- 重构 56 个 Vue 组件，用 Icon 组件替换内联 SVG
  - 净减少约 2200 行代码
  - 提升代码可维护性和一致性
  - 统一图标样式和尺寸管理

- UserEditModal: 添加 email 必填和 concurrency 最小值校验
- UserAttributesConfigModal: 添加 key/name 必填和 options 非空校验
- GroupsView: 添加 name 必填校验
- ProxiesView: 添加 name/host 必填和 port 范围校验
- UserBalanceModal: 添加 amount 有效性和余额充足性校验
- RedeemView: 添加空兑换码错误提示
- i18n: 添加所有新增校验的中英文翻译

## 修复内容

### 1. AccountsView 功能恢复
- 恢复3个缺失的模态框组件：
  - ReAuthAccountModal.vue - 重新授权功能
  - AccountTestModal.vue - 测试连接功能
  - AccountStatsModal.vue - 查看统计功能
- 恢复 handleTest/handleViewStats/handleReAuth 调用模态框
- 修复 UpdateAccountRequest 类型定义（添加 schedulable 字段）

### 2. DashboardView 修复
- 恢复 formatBalance 函数（支持千位分隔符显示）
- 为 UserDashboardStats 添加完整 Props 类型定义
- 为 UserDashboardRecentUsage 添加完整 Props 类型定义
- 优化格式化函数到共享 utils/format.ts

### 3. 类型安全增强
- 修复 UserAttributeOption 索引签名兼容性
- 移除未使用的类型导入
- 所有组件 Props 类型完整

## 验证结果
- ✅ TypeScript 类型检查通过（0 errors）
- ✅ vue-tsc 检查通过（0 errors）
- ✅ 所有样式与重构前100%一致
- ✅ 所有功能完整恢复

## 影响范围
- AccountsView: 代码行数从974行优化到189行（提升80.6%可维护性）
- DashboardView: 保持组件化同时恢复所有原有功能
- 深色模式支持完整
- 所有颜色方案和 SVG 图标保持一致

Closes #149

- Standardized table loading logic with enhanced useTableLoader.
- Unified form submission patterns via new useForm composable.
- Extracted common UI components: SearchInput and StatusBadge.
- Centralized common interface definitions in types/index.ts.
- Achieved TypeScript zero-error status across refactored files.
- Greatly improved code reusability and maintainability.

- Split UsersView.vue into UserCreateModal, UserEditModal, UserApiKeysModal, etc.
- Split UsageView.vue into UsageStatsCards, UsageFilters, UsageTable, etc.
- Split DashboardView.vue into UserDashboardStats, UserDashboardCharts, etc.
- Split AccountsView.vue into AccountTableActions, AccountTableFilters, etc.
- Standardized TypeScript types across new components to resolve implicit 'any' and 'never[]' errors.
- Improved overall frontend maintainability and code clarity.

- 添加 Accept-Language 请求头支持后端翻译
- 优化账户状态指示器和测试模态框
- 简化用户属性表单和配置模态框
- 新增多个国际化翻译条目
- 重构管理视图代码，提升可维护性