Convert Website to Mobile App with Push Notifications (Flutter)

I need a mobile app built using Flutter that loads my fully responsive and functional website inside a WebView.

Requirements:
- Android version required (iOS optional for now)
- Ready for Google Play Store submission
- Integrate push notifications using OneSignal
- Users to receive notifications sent from my server
- Scheduled notifications feature

You will need to provide:
- Full source code
- Signed APK

Ideal skills:
- Flutter development
- OneSignal integration
- Android app deployment