feat: Phase 3 - AES encryption, SQL audit engine, audit logs (85 tests)

Phase 3.1: Instance password AES-256-GCM encryption
Phase 3.2: SQL audit rule engine (10 rules)
Phase 3.3: Auto-audit on ticket creation
Phase 3.4: Operation audit logs + GET /audit/logs
Tests: 44 -> 85 (41 new), Frontend: AuditLogsPage

frontend/src/App.tsx

@@ -15,6 +15,7 @@ import WorkflowPage from '@/pages/WorkflowPage';
 import AutoTaskPage from '@/pages/AutoTaskPage';
 import AnnouncementPage from '@/pages/AnnouncementPage';
 import ConfigPlatformPage from '@/pages/ConfigPlatformPage';
+import AuditLogsPage from '@/pages/AuditLogsPage';
 
 // 路由守卫：未登录跳转登录页，无权限跳转仪表盘
 function RouteGuard() {
@@ -60,6 +61,7 @@ function AppRoutes() {
           <Route path="users" element={<UsersPage />} />
           <Route path="data-permission" element={<DataPermissionPage />} />
           <Route path="audit-rules" element={<AuditRulesPage />} />
+          <Route path="audit-logs" element={<AuditLogsPage />} />
           <Route path="workflow" element={<WorkflowPage />} />
           <Route path="auto-task" element={<AutoTaskPage />} />
           <Route path="announcement" element={<AnnouncementPage />} />