feat: M3-04/05/06 — Workspace Experience, Notification, Cache Module

- M3-04: Workspace Module (RecentItem, Favorite, SearchHistory, Tags, Search, Dashboard)
- M3-05: Notification Module (Preferences, PushToken, Templates, Admin endpoints)
- M3-06: Cache Module (CacheService with wrap/penetration protection, Admin cache management)
- E2E: 27 new tests for M3-04/05/06 (35/36 passing overall)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/config/menu.tsx

@@ -41,6 +41,7 @@ export const adminMenuItems: AdminMenuItem[] = [
     { path: '/events', name: '事件队列' },
     { path: '/vector', name: '向量检索' },
     { path: '/config', name: '配置管理' },
+    { path: '/cache', name: '缓存管理' },
     { path: '/safety', name: '内容安全' },
   ]},
   { path: '/settings', name: '系统配置', icon: <SettingOutlined />, requiredRole: 'ADMIN' },