feat: add login swagger fields

src/modules/auth/dtos/verify-otp.dto.ts

@@ -1,6 +1,7 @@
 import { IsNotEmpty, IsString } from 'class-validator';
 import { PhoneDTO } from './login.dto';
 import { i18nValidationMessage as t } from 'nestjs-i18n';
+import { ApiProperty } from '@nestjs/swagger';
 
 export class VerifyOtpDTO extends PhoneDTO {
   @IsString()
@@ -9,5 +10,11 @@ export class VerifyOtpDTO extends PhoneDTO {
       field: '$t(auth.fields.otp)',
     }),
   })
+  @ApiProperty({
+    type: 'string',
+    description: '5-digit OTP code',
+    example: '12345',
+    required: true,
+  })
   otp!: string;
 }