feat(app): add manual entry and sharing flows

lib/presentation/providers/bluetooth_provider.dart

@@ -0,0 +1,8 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:lunchpick/core/services/bluetooth_service.dart';
+
+final bluetoothServiceProvider = Provider<BluetoothService>((ref) {
+  final service = BluetoothService();
+  ref.onDispose(service.dispose);
+  return service;
+});