Remove notification service and update project

- Remove flutter_local_notifications dependency from pubspec.yaml
- Delete notification_service.dart file
- Remove notification service references from app_service.dart and app_binding.dart
- Clean up related code and dependencies

ohos/oh-package.json5

@@ -1,6 +1,6 @@
 {
   "modelVersion": "5.1.0",
-  "name": "mom_kitchen",
+  "name": "ohos",
   "version": "1.0.0",
   "description": "Please describe the basic information.",
   "main": "",