feat: 增加日志打印和异常处理

backend/src/utils/AppError.ts

@@ -0,0 +1,14 @@
+export class AppError extends Error {
+  statusCode: number;
+  status: string;
+  isOperational: boolean;
+
+  constructor(message: string, statusCode: number) {
+    super(message);
+    this.statusCode = statusCode;
+    this.status = `${statusCode}`.startsWith('4') ? 'fail' : 'error';
+    this.isOperational = true;
+
+    Error.captureStackTrace(this, this.constructor);
+  }
+}