feat(android): add exact alarms permission request entry in Settings\n\n- UI: Settings card shows request when exact alarms not allowed\n- Service: wrap canScheduleExactAlarms/requestExactAlarmsPermission via FLN plugin\n- Keeps changes minimal; no new deps\n\nValidation: scripts/check.sh passed

lib/services/notification_service.dart

@@ -248,6 +248,34 @@ class NotificationService {
     return true; // 기본값
   }
 
+  // Android: 정확 알람 권한 가능 여부 확인 (S+)
+  static Future<bool> canScheduleExactAlarms() async {
+    if (_isWeb) return false;
+    if (Platform.isAndroid) {
+      final android = _notifications.resolvePlatformSpecificImplementation<
+          AndroidFlutterLocalNotificationsPlugin>();
+      if (android != null) {
+        final can = await android.canScheduleExactNotifications();
+        return can ?? true; // 하위 버전은 true 간주
+      }
+    }
+    return true;
+  }
+
+  // Android: 정확 알람 권한 요청 (Android 12+에서 설정 화면으로 이동)
+  static Future<bool> requestExactAlarmsPermission() async {
+    if (_isWeb) return false;
+    if (Platform.isAndroid) {
+      final android = _notifications.resolvePlatformSpecificImplementation<
+          AndroidFlutterLocalNotificationsPlugin>();
+      if (android != null) {
+        final granted = await android.requestExactAlarmsPermission();
+        return granted ?? false;
+      }
+    }
+    return false;
+  }
+
   // 알림 스케줄 설정
   static Future<void> scheduleNotification({
     required int id,