조직 목록 조회

curl --request GET \
  --url https://client-api.tryvox.co/v3/organizations \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "id": "<string>",
      "name": "<string>",
      "is_main": true,
      "created_at": 123,
      "parent_organization_id": "<string>",
      "webhook_url": "<string>"
    }
  ],
  "total_count": 123,
  "next_cursor": "<string>"
}