List available personas

curl --request GET \
  --url https://api.zo.computer/personas/available \
  --header 'Authorization: Bearer <token>'

{
  "personas": [
    {
      "id": "<string>",
      "name": "<string>",
      "prompt": "<string>",
      "model": "<string>",
      "image": "<string>"
    }
  ]
}