setAudioOutput method
Set audio output device (Web/Desktop specific)
Implementation
@override
Future<void> setAudioOutput(String deviceId) async {
// On mobile, we usually use setSpeakerphoneOn, but some platforms might support device selection
// flutter_webrtc doesn't have a direct setAudioOutput for mobile easily accessible via deviceId in Helper
// but we can try using the native implementation if available.
}