feat: add app update checks and standalone release publishing panel

mobile/lib/main.dart

@@ -7,6 +7,7 @@ import 'package:timezone/data/latest.dart' as tzdata;
 import 'app/app_controller.dart';
 import 'app/app_version.dart';
 import 'services/diagnostic_log.dart';
+import 'services/app_update_service.dart';
 import 'app/hepan_app.dart';
 import 'app/tp_startup.dart';
 import 'data/file_snapshot_store.dart';
@@ -22,11 +23,13 @@ Widget buildApplication(
   ValueNotifier<String?>? notificationSelection,
   SchoolSession? school,
   UndergraduateSession? undergraduate,
+  AppUpdateService? updateService,
 }) => HepanApp(
   controller: controller,
   notificationSelection: notificationSelection,
   school: school,
   undergraduate: undergraduate,
+  updateService: updateService,
   undergraduateBuilder: undergraduate == null
       ? null
       : () => UndergraduateAuthPage(
@@ -63,6 +66,7 @@ Future<void> main() async {
         notificationSelection: selection,
         school: SchoolSession(),
         undergraduate: UndergraduateSession(),
+        updateService: AppUpdateService(),
       );
     },
     onHomeReady: () {