feat: Implement dynamic filtering for agent search based on profile fields.

src/agents/dto/search-agents.dto.ts

@@ -72,4 +72,12 @@ export class SearchAgentsDto {
   @IsOptional()
   @IsString()
   sortOrder?: 'asc' | 'desc' = 'desc';
+
+  @ApiPropertyOptional({
+    description: 'Dynamic profile field filters as JSON string (fieldSlug: [selectedValues])',
+    example: '{"client_specialization":["first_time_buyers","investors"]}',
+  })
+  @IsOptional()
+  @IsString()
+  filters?: string;
 }