feat(search): implement Search module with Typesense full-text & geo search

- TypesenseClient service with configurable connection
- Collection schema for listings with facets, geo-point, and Vietnamese text
- ListingIndexer service with PostGIS coordinate extraction for geo search
- CQRS commands: SyncListing, ReindexAll (batch with pagination)
- CQRS queries: SearchProperties (filters, sorting), GeoSearch (radius)
- Event handlers for listing.approved/updated/deactivated auto-sync
- REST endpoints: GET /search, GET /search/geo, POST /search/reindex (admin)
- DTOs with class-validator validation and pagination

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

apps/api/src/app.module.ts

@@ -1,5 +1,7 @@
 import { SharedModule } from '@modules/shared';
 import { AuthModule } from '@modules/auth';
+import { ListingsModule } from '@modules/listings';
+import { SearchModule } from '@modules/search';
 import { NotificationsModule } from '@modules/notifications';
 import { Module } from '@nestjs/common';
 import { APP_GUARD } from '@nestjs/core';
@@ -13,6 +15,8 @@ import { AppController } from './app.controller';
     CqrsModule.forRoot(),
     SharedModule,
     AuthModule,
+    ListingsModule,
+    SearchModule,
     NotificationsModule,
 
     // ── Rate Limiting ──