feat: complete admin backend controllers and services

- AdminPlansController & Service (CRUD, reorder)
- AdminPaymentMethodsController & Service (CRUD, reorder)
- AdminPaymentsController & Service (verify, reject, pending count)
- AdminUsersController & Service (search, suspend, grant pro access, stats)
- AdminConfigController & Service (dynamic config management)
- Wire all controllers into AdminModule
- Import AdminModule in AppModule

Admin API Routes:
- GET/POST/PUT/DELETE /admin/plans
- GET/POST/PUT/DELETE /admin/payment-methods
- GET /admin/payments (with status filter)
- POST /admin/payments/:id/verify
- POST /admin/payments/:id/reject
- GET /admin/users (with search)
- POST /admin/users/:id/grant-pro
- GET/POST/DELETE /admin/config

All routes protected by AuthGuard + AdminGuard

apps/api/dist/wallets/wallets.controller.d.ts

@@ -27,11 +27,11 @@ export declare class WalletsController {
         id: string;
         createdAt: Date;
         userId: string;
-        walletId: string;
-        date: Date;
         amount: import("@prisma/client/runtime/library").Decimal;
         direction: string;
+        date: Date;
         memo: string | null;
+        walletId: string;
         recurrenceId: string | null;
     }[]>;
     create(req: RequestWithUser, body: {