Listar grupos de activos de material

curl "https://api.tokenlab.sh/v1/videos/assets/groups?library_type=aigc_avatar&page_size=20" \
  -H "Authorization: Bearer $TOKENLAB_API_KEY"

{
  "groups": [
    {
      "id": "group-20260720123456-vrt01",
      "object": "seedance.material_asset_group",
      "library_type": "aigc_avatar",
      "group_name": "Product references",
      "status": "ACTIVE",
      "created_at": 1782998400000
    }
  ],
  "next_page_token": null
}