feat(app): finalize ad gated flows and weather

- add AppLogger and replace scattered print logging\n- implement ad-gated recommendation flow with reminder handling and calendar link\n- complete Bluetooth share pipeline with ad gate and merge\n- integrate KMA weather API with caching and dart-define decoding\n- add NaverUrlProcessor refactor and restore restaurant repository tests

lib/main.dart

@@ -44,8 +44,7 @@ void main() async {
   // Initialize Notification Service (only for non-web platforms)
   if (!kIsWeb) {
     final notificationService = NotificationService();
-    await notificationService.initialize();
-    await notificationService.requestPermission();
+    await notificationService.ensureInitialized(requestPermission: true);
   }
 
   // Get saved theme mode