OAuth2 bearer authentication and the respective read/write permission are required; write does not imply read.Group type is fixed to content_tag. Create/reuse by label; parent_group_id or parent_label is optional. Omitting parent clears the existing parent.需要 OAuth2 Bearer token 和对应读 / 写权限;写不包含读。组类型固定为 content_tag,不能操作客户标签组。按名称创建或复用;可设置 parent_group_id 或 parent_label,省略父级会清除旧父级。