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/presentation/dto/search-properties.dto.ts

@@ -0,0 +1,88 @@
+import {
+  IsOptional,
+  IsString,
+  IsNumber,
+  IsEnum,
+  IsInt,
+  Min,
+  Max,
+} from 'class-validator';
+import { Transform, Type } from 'class-transformer';
+
+export enum SortByOption {
+  PRICE_ASC = 'price_asc',
+  PRICE_DESC = 'price_desc',
+  DATE_DESC = 'date_desc',
+  RELEVANCE = 'relevance',
+}
+
+export class SearchPropertiesDto {
+  @IsOptional()
+  @IsString()
+  q?: string;
+
+  @IsOptional()
+  @IsString()
+  propertyType?: string;
+
+  @IsOptional()
+  @IsString()
+  transactionType?: string;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsNumber()
+  @Min(0)
+  priceMin?: number;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsNumber()
+  @Min(0)
+  priceMax?: number;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsNumber()
+  @Min(0)
+  areaMin?: number;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsNumber()
+  @Min(0)
+  areaMax?: number;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(0)
+  bedrooms?: number;
+
+  @IsOptional()
+  @IsString()
+  district?: string;
+
+  @IsOptional()
+  @IsString()
+  city?: string;
+
+  @IsOptional()
+  @IsEnum(SortByOption)
+  sortBy?: SortByOption;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  @Transform(({ value }) => value ?? 1)
+  page?: number;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  @Max(100)
+  @Transform(({ value }) => value ?? 20)
+  perPage?: number;
+}