curl --request POST \
  --url https://juiywycqytekaffjcbfa.supabase.co/functions/v1/api-v1/agent/{id}/add-message \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "content": "<string>",
  "role": "ai",
  "conversation_id": "<string>"
}
'

{
  "success": true,
  "data": {
    "message": {
      "id": "<string>",
      "content": "<string>",
      "sender_type": "customer",
      "message_type": "<string>",
      "created_at": "<string>"
    }
  }
}