fix：参考金值，研听，研值工程通用通用工程公共能力，重点对比网络请求、登录认证、状态管理、本地存储、WebView、推送、版本更新、一键登录、主题/UI 等模块，确定后续统一整改方案

lib/common/push/umeng_push_service.dart

@@ -12,11 +12,12 @@ import '../storage/storage_keys.dart';
 import '../storage/storage_service.dart';
 
 abstract final class UmengPushService {
+  static const _maxPendingNotificationOpens = 20;
   static final _tokens = StreamController<String>.broadcast();
   static Future<void>? _starting;
   static bool _started = false;
   static void Function(String payload)? _onNotificationOpen;
-  static String? _pendingNotificationOpen;
+  static final List<String> _pendingNotificationOpens = [];
 
   static Stream<String> get onDeviceToken => _tokens.stream;
 
@@ -24,10 +25,10 @@ abstract final class UmengPushService {
     void Function(String payload) callback,
   ) {
     _onNotificationOpen = callback;
-    final pending = _pendingNotificationOpen;
-    if (pending != null) {
-      _pendingNotificationOpen = null;
-      callback(pending);
+    final pending = List<String>.of(_pendingNotificationOpens);
+    _pendingNotificationOpens.clear();
+    for (final payload in pending) {
+      callback(payload);
     }
   }
 
@@ -56,7 +57,10 @@ abstract final class UmengPushService {
     UmengPushSdk.setNotificationCallback((_) {}, (payload) {
       final callback = _onNotificationOpen;
       if (callback == null) {
-        _pendingNotificationOpen = payload;
+        if (_pendingNotificationOpens.length == _maxPendingNotificationOpens) {
+          _pendingNotificationOpens.removeAt(0);
+        }
+        _pendingNotificationOpens.add(payload);
       } else {
         callback(payload);
       }