API 错误码不统一？六类错误响应的落地模板（JSON示例+表格）

{
  "code": 1001,
  "http": 400,
  "message": "字段校验失败",
  "details": [
    { "field": "email", "issue": "格式不正确" },
    { "field": "age", "issue": "必须为正整数" }
  ],
  "traceId": "abc-123"
}

{
  "code": 2001,
  "http": 401,
  "message": "未认证或Token过期",
  "details": [],
  "traceId": "abc-123"
}

{
  "code": 5001,
  "http": 500,
  "message": "服务器内部错误",
  "details": [],
  "traceId": "abc-123"
}