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/modules/search/infrastructure/event-handlers/index.ts

@@ -0,0 +1 @@
+export { ListingApprovedEventHandler } from './listing-approved.handler';

apps/api/src/modules/search/infrastructure/event-handlers/listing-approved.handler.ts

@@ -0,0 +1,30 @@
+import { Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { LoggerService } from '@modules/shared/infrastructure/logger.service';
+import { ListingIndexerService } from '../services/listing-indexer.service';
+
+@Injectable()
+export class ListingApprovedEventHandler {
+  constructor(
+    private readonly indexer: ListingIndexerService,
+    private readonly logger: LoggerService,
+  ) {}
+
+  @OnEvent('listing.approved')
+  async handle(payload: { listingId: string }): Promise<void> {
+    this.logger.log(`Handling listing.approved for ${payload.listingId}`, 'ListingApprovedHandler');
+    await this.indexer.indexListing(payload.listingId);
+  }
+
+  @OnEvent('listing.updated')
+  async handleUpdate(payload: { listingId: string }): Promise<void> {
+    this.logger.log(`Handling listing.updated for ${payload.listingId}`, 'ListingApprovedHandler');
+    await this.indexer.indexListing(payload.listingId);
+  }
+
+  @OnEvent('listing.deactivated')
+  async handleDeactivation(payload: { listingId: string }): Promise<void> {
+    this.logger.log(`Handling listing.deactivated for ${payload.listingId}`, 'ListingApprovedHandler');
+    await this.indexer.removeListing(payload.listingId);
+  }
+}