curl -X GET "http://CONTROL_PLANE_IP:PORT/list_desktop_environments"

{
  "environments": [
    {
      "vm_id": "vm-abc123",
      "provider": "docker",
      "os_type": "Ubuntu",
      "status": "active",
      "start_time": 1234567890.123,
      "timeout": 3600,
      "age_seconds": 1200.5,
      "vnc_port": 8001,
      "last_open_connection": 1234568000.0,
      "time_since_last_connection": 90.123
    }
  ],
  "total": 1
}

{
  "environments": [],
  "total": 0
}