feat(api): add reviews module with CRUD endpoints and CQRS

Implement polymorphic reviews system supporting any target type (agent,
property, etc.) with DDD/CQRS architecture following existing patterns.

Endpoints:
- POST /api/reviews — create review (authenticated)
- GET /api/reviews?targetType=&targetId= — list reviews by target
- GET /api/reviews/stats?targetType=&targetId= — aggregate rating stats
- GET /api/reviews/me — list authenticated user's reviews
- DELETE /api/reviews/:id — delete own review

Business rules: 1-5 rating validation, self-review prevention, one
review per user per target. Includes 15 unit tests for all handlers.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/app.module.ts

@@ -11,6 +11,7 @@ import { McpIntegrationModule } from '@modules/mcp';
 import { HttpMetricsInterceptor, MetricsModule } from '@modules/metrics';
 import { NotificationsModule } from '@modules/notifications';
 import { PaymentsModule } from '@modules/payments';
+import { ReviewsModule } from '@modules/reviews';
 import { SearchModule } from '@modules/search';
 import { SharedModule } from '@modules/shared';
 import { ThrottlerBehindProxyGuard } from '@modules/shared/infrastructure/guards/throttler-behind-proxy.guard';
@@ -26,6 +27,7 @@ import { AppController } from './app.controller';
     SharedModule,
     AuthModule,
     ListingsModule,
+    ReviewsModule,
     SearchModule,
     NotificationsModule,
     PaymentsModule,