列出素材组

{
  "data": {
    "items": [
      {
        "groupId": "group_xxx",
        "displayName": "产品素材",
        "description": "",
        "groupType": "AIGC",
        "assetCount": 2,
        "coverAssetId": "asset_xxx",
        "coverUrl": "https://cdn.example.com/cover.png",
        "createdAt": 1784600000,
        "updatedAt": 1784600100
      }
    ]
  },
  "error": null,
  "request_id": "req_xxx"
}

{
  "data": null,
  "error": {
    "code": "invalid_request",
    "message": "request is invalid"
  },
  "request_id": "req_xxx"
}

{
  "data": null,
  "error": {
    "code": "invalid_request",
    "message": "request is invalid"
  },
  "request_id": "req_xxx"
}

{
  "data": null,
  "error": {
    "code": "invalid_request",
    "message": "request is invalid"
  },
  "request_id": "req_xxx"
}

{
  "data": null,
  "error": {
    "code": "invalid_request",
    "message": "request is invalid"
  },
  "request_id": "req_xxx"
}

{
  "data": null,
  "error": {
    "code": "invalid_request",
    "message": "request is invalid"
  },
  "request_id": "req_xxx"
}