fix: 更新 PushToken 重试间隔为 8s， 添加无网络判定

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

Runtime/GuruCore/Runtime/Firebase/FirebaseUtil.Message.cs

@@ -13,7 +13,7 @@ namespace Guru
 	public static partial class FirebaseUtil
 	{
 		private static int _retryDeviceCount = 1;
-		private const int _retryTokenDelay = 2;
+		private const int _retryTokenDelay = 8;
 		// public static bool? IsInitMessage;
 		private static bool _isAutoFetchFcmToken = true;
 		private static bool _isFetchOnce = false;
@@ -52,6 +52,13 @@ namespace Guru
 		/// </summary>
 		private static void GetFCMTokenAsync()
 		{
+			if (!NetworkUtil.IsNetAvailable)
+			{
+				// 无网络直接重新获取
+				DelayGetFCMToken(_retryTokenDelay);
+				return;
+			}
+
 			Debug.Log($"{LOG_TAG}[SDK]--- Start GetTokenAsync ---");
 			FirebaseMessaging.GetTokenAsync().ContinueWithOnMainThread(task =>
 			{