init：代码初始化

src/middlewares/errorHandler.js

@@ -0,0 +1,74 @@
+/**
+ * 统一错误处理中间件
+ */
+
+/**
+ * 404 错误处理
+ */
+function notFound(req, res, next) {
+  const error = new Error(`Not Found - ${req.originalUrl}`);
+  error.statusCode = 404;
+  next(error);
+}
+
+/**
+ * 统一错误响应处理
+ */
+function errorHandler(err, req, res, next) {
+  // 设置状态码
+  const statusCode = err.statusCode || 500;
+
+  // 开发环境返回详细错误信息，生产环境返回简化信息
+  const isDevelopment = process.env.NODE_ENV === 'development';
+
+  res.status(statusCode).json({
+    success: false,
+    message: err.message || '服务器内部错误',
+    error: isDevelopment ? {
+      stack: err.stack,
+      ...err
+    } : undefined,
+    statusCode
+  });
+
+  // 记录错误日志
+  if (statusCode >= 500) {
+    console.error('❌ Server Error:', {
+      message: err.message,
+      stack: err.stack,
+      url: req.originalUrl,
+      method: req.method,
+      body: req.body,
+      query: req.query,
+      params: req.params
+    });
+  }
+}
+
+/**
+ * 异步错误捕获包装器
+ */
+function asyncHandler(fn) {
+  return (req, res, next) => {
+    Promise.resolve(fn(req, res, next)).catch(next);
+  };
+}
+
+/**
+ * 自定义错误类
+ */
+class AppError extends Error {
+  constructor(message, statusCode = 500) {
+    super(message);
+    this.statusCode = statusCode;
+    this.isOperational = true;
+    Error.captureStackTrace(this, this.constructor);
+  }
+}
+
+module.exports = {
+  notFound,
+  errorHandler,
+  asyncHandler,
+  AppError
+};