update: 添加 iOS 标志位缓存， 请求时直接返回状态

Signed-off-by: huyufei <yufei.hu@castbox.fm>

Runtime/GuruNoification/Manager/NotificationAgentIOS.cs

@@ -59,6 +59,14 @@ namespace Guru.Notification
         public void RequestPermission(Action<string> callback = null)
         {
             if (!_initOnce) Init();
+
+            if (_notiStatus == STATUS_GRANTED || _notiStatus == STATUS_DENIDED)
+            {
+                Debug.Log($"[SDK][Noti][iOS] --- Already has Status: {_notiStatus}");
+                callback?.Invoke(_notiStatus); // 已获得授权， 直接返回结果
+                return;
+            }
+            
 #if UNITY_IOS
             RequestIOSPermission(callback);
 #endif
@@ -70,10 +78,8 @@ namespace Guru.Notification
         private void InitPlugins()
         {
             UpdateStatus();
-            
         }
         
-
         /// <summary>
         /// 更新状态
         /// </summary>