feat: establish backend foundation

src/common/decorators/api-safe-error-response.decorator.ts

@@ -0,0 +1,19 @@
+import { ApiInternalServerErrorResponse, ApiProperty } from '@nestjs/swagger';
+
+export class SafeErrorResponseDto {
+  @ApiProperty({ example: 500 })
+  statusCode: number;
+
+  @ApiProperty({ example: 'Internal server error' })
+  message: string;
+
+  @ApiProperty({ example: '/api/v1' })
+  path: string;
+}
+
+export function ApiSafeErrorResponse(): MethodDecorator & ClassDecorator {
+  return ApiInternalServerErrorResponse({
+    description: 'Internal server error',
+    type: SafeErrorResponseDto,
+  });
+}