some error handler + error validation + realEstate bug fixed for hamta end moallem

src/inquiry/dto/real-estate-request.dto.ts

@@ -0,0 +1,18 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { IsNotEmpty, IsString, Length, Matches } from 'class-validator';
+
+export class RealEstateRequestDto {
+  @ApiProperty({ example: '5098961130', description: 'Iranian national code (10 digits)' })
+  @IsString()
+  @IsNotEmpty()
+  @Length(10, 10)
+  @Matches(/^\d{10}$/, { message: 'nationalCode must be exactly 10 digits' })
+  nationalCode!: string;
+
+  @ApiProperty({ example: '1349689554', description: 'Postal code (10 digits)' })
+  @IsString()
+  @IsNotEmpty()
+  @Length(10, 10)
+  @Matches(/^\d{10}$/, { message: 'postalCode must be exactly 10 digits' })
+  postalCode!: string;
+}