feat: add remote pull and push

lib/main.dart

@@ -4,11 +4,13 @@ import 'package:flutter/services.dart';
 import 'package:intl/date_symbol_data_local.dart';
 import 'package:intl/intl.dart';
 import 'package:kooltab2/services/pin_lock_service.dart';
+import 'package:kooltab2/services/remote_sync_service.dart';
 import 'package:kooltab2/services/settings_service.dart';
 import 'package:kooltab2/viewmodels/dev_menu_view_model.dart';
 import 'package:kooltab2/viewmodels/history_view_model.dart';
 import 'package:kooltab2/viewmodels/inventory_view_model.dart';
 import 'package:kooltab2/viewmodels/pin_lock_view_model.dart';
+import 'package:kooltab2/viewmodels/registration_view_model.dart';
 import 'package:kooltab2/viewmodels/settings_view_model.dart';
 import 'package:provider/provider.dart';
 import 'package:sentry_flutter/sentry_flutter.dart';
@@ -23,6 +25,7 @@ import 'services/product_service.dart';
 import 'viewmodels/bar_screen_view_model.dart';
 import 'viewmodels/admin_pin_view_model.dart';
 import 'viewmodels/product_list_view_model.dart';
+import 'viewmodels/remote_sync_view_model.dart';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -48,9 +51,29 @@ Future<void> main() async {
   );
   await adminPinViewModel.ensureLoaded();
 
+  final remoteSyncService = RemoteSyncService(
+    database: database,
+    barTabService: DriftBarTabService(database: database),
+  );
+
+  final remoteSyncViewModel = RemoteSyncViewModel(
+    syncService: remoteSyncService,
+  );
+
+  final isConfiguredNotifier = ValueNotifier<bool>(await remoteSyncService.isConfigured);
+
+  remoteSyncViewModel.addListener(() {
+    isConfiguredNotifier.value = remoteSyncViewModel.isConfigured;
+  });
+
+  final registrationViewModel = RegistrationViewModel(
+    syncService: remoteSyncService,
+  );
+
   final appRouter = createAppRouter(
     pinLockViewModel,
     adminPinViewModel: adminPinViewModel,
+    isConfiguredNotifier: isConfiguredNotifier,
   );
 
   await SentryFlutter.init(
@@ -83,6 +106,13 @@ Future<void> main() async {
             create: (context) =>
                 DriftSettingsService(database: context.read<AppDatabase>()),
           ),
+          Provider<RemoteSyncService>.value(value: remoteSyncService),
+          ChangeNotifierProvider<RemoteSyncViewModel>.value(
+            value: remoteSyncViewModel,
+          ),
+          ChangeNotifierProvider<RegistrationViewModel>.value(
+            value: registrationViewModel,
+          ),
           ChangeNotifierProvider<InventoryViewModel>(
             create: (context) => InventoryViewModel(
               productService: context.read<ProductService>(),
@@ -98,6 +128,7 @@ Future<void> main() async {
             create: (context) => BarScreenViewModel(
               barTabService: context.read<BarTabService>(),
               inventory: context.read<InventoryViewModel>(),
+              remoteSyncViewModel: context.read<RemoteSyncViewModel>(),
             ),
           ),
           ChangeNotifierProvider<HistoryViewModel>(