创建素材组

https://api.gravitex.ai/api/v3/seedance?Action=CreateAssetGroup&Version=2024-01-01

curl -X POST "https://api.gravitex.ai/api/v3/seedance?Action=CreateAssetGroup&Version=2024-01-01" \
  -H "Authorization: Bearer sk-your_token_key" \
  -H "Content-Type: application/json" \
  -d '{"Name": "角色A", "Description": "测试角色"}'

{
  "ResponseMetadata": {"Action": "CreateAssetGroup", "Version": "2024-01-01", "Service": "ark"},
  "Result": {"Id": "group-20260710-abcde"}
}