エラー処理

{
  "success": false,
  "error": {
    "code": 400,
    "timestamp": "2024-01-01T00:00:00.000Z",
    "message": "ユーザーフレンドリーなエラーメッセージ",
    "details": [
      {
        "code": "validation/missing-field",
        "message": "field_name は必須です。"
      }
    ]
  }
}

{
  "success": false,
  "error": {
    "code": 400,
    "timestamp": "2024-01-01T00:00:00.000Z",
    "message": "リクエストパラメータが無効です。",
    "details": [
      {
        "code": "validation/missing-user_id",
        "message": "user_id は必須です。"
      },
      {
        "code": "validation/invalid-email",
        "message": "メールアドレスの形式が無効です。"
      }
    ]
  }
}

{
  "success": false,
  "error": {
    "code": 401,
    "timestamp": "2024-01-01T00:00:00.000Z",
    "message": "認証が必要です",
    "details": "authorization/missing_token"
  }
}

{
  "success": false,
  "error": {
    "code": 403,
    "timestamp": "2024-01-01T00:00:00.000Z",
    "message": "権限が不十分です",
    "details": "authorization/insufficient_permissions"
  }
}

{
  "success": false,
  "error": {
    "code": 404,
    "timestamp": "2024-01-01T00:00:00.000Z",
    "message": "リソースが見つかりません",
    "details": "error/resource_not_found"
  }
}

{
  "success": false,
  "error": {
    "code": 409,
    "timestamp": "2024-01-01T00:00:00.000Z",
    "message": "リソースは既に存在します",
    "details": "error/duplicate_resource"
  }
}

{
  "success": false,
  "error": {
    "code": 500,
    "timestamp": "2024-01-01T00:00:00.000Z",
    "message": "内部サーバーエラー",
    "details": "error/internal_server_error"
  }
}