Realtime WebSocket connection

Establish a WebSocket connection for realtime conversations. **Note**: This is a WebSocket endpoint and must be connected using the WebSocket protocol. Example connection URL: `wss://api.example.com/v1/realtime?model=gpt-4o-realtime`

curl -X GET "https://example.com/v1/realtime"

{
  "success": true,
  "message": "string",
  "data": null
}

{
  "error": {
    "code": "string",
    "message": "string",
    "request_id": "string"
  }
}