feat: Phase 2 — frontend-backend integration complete

- All 5 core pages now use real API instead of mock data
  - Dashboard: /api/v1/dashboard/stats
  - Tickets: list/create/detail/approve/execute/statistics
  - Users: list/create/toggle-active/delete
  - Instances: list/create/test-connection/delete
  - Queries: execute with result display + sensitive field masking
- Updated DashboardStats type to match backend schema
- Fixed InstancePage to work with InstanceResponse (no qps/cpu/metrics yet)
- Added create forms for Tickets, Users, Instances
- Added connection test in InstanceDetail
- Updated TDD_PLAN.md: Phase 1 ✅ (44 tests), Phase 2 ✅
- Updated ROADMAP.md: v0.2.0 ✅
- Updated PROJECT_EVALUATION.md: score 5.7 → 6.2
- Frontend build passes with zero TS errors
- 44 backend tests still passing

frontend/src/types/index.ts

@@ -159,14 +159,14 @@ export interface PermissionNode {
 }
 
 export interface DashboardStats {
-  todayTickets: number;
-  todayTicketsTrend: number;
-  pendingApproval: number;
-  pendingTrend: number;
-  queryAuditCount: number;
-  queryTrend: number;
-  slowQueries: number;
-  slowQueryTrend: number;
+  ticket_total: number;
+  ticket_pending: number;
+  ticket_month: number;
+  ticket_executing: number;
+  instance_total: number;
+  instance_online: number;
+  user_total: number;
+  queries_today: number;
 }
 
 export interface MenuItem {