curl "https://api.telzino.com/v1/custom-voices?organizationId=ORG_UUID" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

{
  "data": [
    {
      "id": "cloned-3f2a...",
      "name": "Jane (front desk)",
      "description": "Custom cloned voice",
      "provider": "cartesia",
      "custom": true,
      "language": "en"
    }
  ]
}