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fix(frontend): admin custom menu items not showing in sidebar

The public settings API filters out menu items with visibility='admin',
so customMenuItemsForAdmin was always empty when reading from
cachedPublicSettings. Fix by loading custom menu items from the admin
settings API (via adminSettingsStore) which returns all items unfiltered.

Changes:
- adminSettings store: store custom_menu_items from admin settings API
- AppSidebar: read admin menu items from adminSettingsStore instead of
  cachedPublicSettings
- CustomPageView: merge public and admin menu items so admin users can
  access admin-only custom pages

feat(gateway): 双模式用户消息队列 — 串行队列 + 软性限速

feat: custom menu pages with iframe embedding and CSP injection

Replaced by filterUserVisibleMenuItems which includes both array
validation and admin-item filtering.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1. (Critical) Filter admin-only menu items from public API responses -
   both GetPublicSettings handler and GetPublicSettingsForInjection now
   exclude visibility=admin items, preventing unauthorized access to
   admin menu URLs.

2. (Medium) Validate JSON array structure in sanitizeCustomMenuItemsJSON -
   use json.Unmarshal into []json.RawMessage instead of json.Valid to
   reject non-array JSON values that would cause frontend runtime errors.

3. (Medium) Decouple router from business JSON parsing - move origin
   extraction logic from router.go to SettingService.GetFrameSrcOrigins,
   eliminating direct JSON parsing of custom_menu_items in the routing
   layer.

4. (Low) Restrict custom menu item ID charset to [a-zA-Z0-9_-] via
   regex validation, preventing route-breaking characters like / ? # or
   spaces.

5. (Low) Handle crypto/rand error in generateMenuItemID - return error
   instead of silently ignoring, preventing potential duplicate IDs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Add admin menu permission check in CustomPageView (visibility + role)
- Sanitize SVG content with DOMPurify before v-html rendering (XSS prevention)
- Decouple router.go from dto package using anonymous struct
- Consolidate duplicate parseCustomMenuItems into dto.ParseCustomMenuItems
- Enhance menu item validation (count, length, ID uniqueness limits)
- Add audit logging for purchase_subscription and custom_menu_items changes
- Update API contract test to include custom_menu_items field
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add configurable custom menu items that appear in sidebar, each rendering
an iframe-embedded external page. Includes shared URL builder with
src_host/src_url tracking, CSP frame-src multi-origin deduplication,
admin settings UI, and i18n support.

chore: bump version to 0.1.87.19
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

新增 UMQ (User Message Queue) 双模式支持:
- serialize: 账号级分布式串行锁 + RPM 自适应延迟（严格限流）
- throttle: 仅 RPM 自适应前置延迟，不阻塞并发（软性限速）

后端:
- config: 新增 Mode 字段，保留 Enabled 向后兼容
- service: 新增 UserMessageQueueService（Lua 锁/延迟算法/清理 worker）
- repository: 新增 UserMsgQueueCache（Redis Lua acquire/release/force-release）
- handler: 新增 UserMsgQueueHelper（SSE ping + 等待循环 + throttle）
- gateway: 按 mode 分支集成 serialize/throttle 逻辑
- lint: 修复 gofmt rewrite rules、errcheck 类型断言、staticcheck QF1012

前端:
- 三态选择器 UI（关闭/软性限速/串行队列）替代 toggle 开关
- BulkEdit 支持 null 语义（不修改）
- i18n 中英文文案

通过 6 轮专家评审（42 次 review）、golangci-lint、单元测试、集成测试。

feat(proxy): 集中代理 URL 验证并实现全局 fail-fast

提取 proxyurl.Parse() 公共包，将分散在 6 处的代理 URL 验证逻辑
统一收敛，确保无效代理配置在创建时立即失败，永不静默回退直连。

主要变更：
- 新增 proxyurl 包：统一 TrimSpace → url.Parse → Host 校验 → Scheme 白名单
- socks5:// 自动升级为 socks5h://，防止 DNS 泄漏（大小写不敏感）
- antigravity: http.ProxyURL → proxyutil.ConfigureTransportProxy 支持 SOCKS5
- openai_oauth: 删除 newOpenAIOAuthHTTPClient，收编至 httpclient.GetClient
- 移除未使用的 ProxyStrict 字段（fail-fast 已是全局默认行为）
- 补充 15 个 proxyurl 测试 + pricing/usage fail-fast 测试

feat(settings): add default subscriptions for new users

feat(identity): 指纹缓存 TTL 懒续期机制

fix(dashboard): sort recent usage tooltip labels by token consumption

- add default subscriptions to admin settings

- auto-assign subscriptions on register and admin user creation

- add validation/tests and align settings UI with subscription selector patterns

- TTL 改为 7 天，配合 24 小时自动续期保持活跃账号永不过期
- 版本升级时采用合并语义，仅更新请求中实际存在的字段
- 添加产品名验证防止浏览器 UA 误判为更新版本

feat(admin): 代理密码可见性 + 复制代理 URL 功能

- 新增 AdminProxy / AdminProxyWithAccountCount DTO，遵循项目 Admin DTO 分层模式
- Proxy.Password 恢复 json:"-" 隐藏，ProxyFromService 不再赋值密码（纵深防御）
- 管理员接口使用 ProxyFromServiceAdmin / ProxyWithAccountCountFromServiceAdmin
- 前端代理列表新增 Auth 列：显示用户名 + 掩码密码 + 眼睛图标切换可见性
- Address 列新增复制按钮：左键复制完整 URL，右键选择格式
- 编辑模态框密码预填充 + 脏标记，避免误更新

feat(dashboard): add group usage distribution chart to usage page

Add a doughnut chart showing usage statistics broken down by group on
the admin usage records page. The chart appears alongside the existing
model distribution chart (2-column grid), with the token usage trend
chart moved to a separate full-width row below.

Changes:
- backend/pkg/usagestats: add GroupStat type
- backend/service: add GetGroupStatsWithFilters interface method and implementation
- backend/repository: implement GetGroupStatsWithFilters with LEFT JOIN groups
- backend/handler: add GetGroupStats handler with full filter support
- backend/routes: register GET /admin/dashboard/groups route
- backend/tests: add GetGroupStatsWithFilters stubs to contract/sora tests
- frontend/types: add GroupStat interface
- frontend/api: add getGroupStats API function and types
- frontend/components: add GroupDistributionChart.vue doughnut chart
- frontend/views: update UsageView layout and load group stats in parallel
- frontend/i18n: add groupDistribution, group, noGroup keys (zh + en)

fix(group): clear nullable limit fields on update

Upgrade GitHub Actions to latest versions

feat: add mixed-channel warning for bulk account edit

feat(admin): add create-and-redeem endpoint for payment integrations

Upgrade GitHub Actions for Node 24 compatibility

- Move ADMIN_PAYMENT_INTEGRATION_API.md → docs/ADMIN_PAYMENT_INTEGRATION_API.md
- Update README.md reference path
- Add payment integration doc download link in admin settings UI (Purchase section)
- Add i18n keys: integrationDoc / integrationDocHint (zh + en)

feat(gateway): 添加 Claude Code 客户端最低版本检查功能

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

- 修复 errcheck: singleflight 返回值类型断言添加 ok 检查
- 修复 gofmt: 格式化 setting_service.go 和 claude_code_validator_test.go
- 修复 TestAPIContracts: 在 GET /admin/settings 期望中添加 min_claude_code_version 字段

- 通过 User-Agent 识别 Claude Code 客户端并提取版本号
- 在网关层验证客户端版本是否满足管理员配置的最低要求
- 在管理后台提供版本要求配置选项（英文/中文双语）
- 实现原子缓存 + singleflight 防止并发问题和 thundering herd
- 使用 context.WithoutCancel 隔离 DB 查询，避免客户端断连影响缓存
- 双 TTL 策略：60s 正常、5s 错误恢复，保证性能与可用性
- 仅检查 Claude Code 客户端，其他客户端不受影响
- 添加完整单元测试覆盖版本提取、比对、上下文操作