feat: 全局监听iap，在home初始化。避免过早处理，升级dart和flutter，支持storekit插件，强制指定storekit2版本

lib/app/utils/account_guard.dart

@@ -5,6 +5,7 @@ import 'package:kaer_with_panels/app/widgets/dialogs/hi_dialog.dart';
 import 'package:kaer_with_panels/app/routes/app_pages.dart';
 import 'package:kaer_with_panels/app/utils/kr_common_util.dart';
 import 'package:kaer_with_panels/app/services/kr_site_config_service.dart';
+import 'package:kaer_with_panels/app/services/iap/iap_service.dart';
 
 Future<bool> ensureAccountExists() async {
   final app = KRAppRunData.getInstance();
@@ -27,6 +28,7 @@ Future<bool> ensureAccountExists() async {
     return false;
   }
 
+  KRIAPService.instance.setup();
   var crispId = config.kr_website_id;
   var deviceLimitText = config.device_limit;
   var deviceLimit = int.tryParse(deviceLimitText) ?? 0;