feat: 实现日历提醒 in-app fallback 机制及通知服务重构

apps/test/platform/android_manifest_notification_action_test.dart

@@ -0,0 +1,20 @@
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  test('AndroidManifest declares ActionBroadcastReceiver', () {
+    final manifestFile = File('android/app/src/main/AndroidManifest.xml');
+
+    expect(manifestFile.existsSync(), isTrue);
+
+    final manifestContent = manifestFile.readAsStringSync();
+
+    expect(
+      manifestContent,
+      contains(
+        'com.dexterous.flutterlocalnotifications.ActionBroadcastReceiver',
+      ),
+    );
+  });
+}