feat: 统一后端响应格式

apps/backend/src/common/exceptions/business.exception.ts

@@ -0,0 +1,22 @@
+import { HttpStatus } from '@nestjs/common';
+
+export class BusinessException {
+
+    public statusCode: HttpStatus;
+    public message: string;
+    public code: number;
+    public data: any;
+
+    constructor(args: {
+        statusCode?: HttpStatus,
+        message?: string,
+        code?: number,
+        data?: any,
+    }) {
+        const { statusCode, message, code, data } = args;
+        this.statusCode = statusCode || HttpStatus.BAD_REQUEST;
+        this.message = message || '请求错误';
+        this.code = code || -1;
+        this.data = data || null;
+    }
+}