增加RCU上离线功能，能耗双通道

CommonTools/Tools.cs

@@ -572,6 +572,14 @@ namespace CommonTools
             long unixTimestampMillisecondsManual = (long)(DateTime.UtcNow - unixEpoch).TotalSeconds;
             return unixTimestampMillisecondsManual;
         }
+        public static long GetUnixTime_MS()
+        {
+            //DateTime unixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+            //double unixTimestampMillisecondsManual = (DateTime.UtcNow - unixEpoch).TotalMilliseconds;
+            //return unixTimestampMillisecondsManual;
+
+            return DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();  // 返回 long
+        }
         public static DateTime GetTimeFromUnixTime(long timestampSeconds)
         {
             // Unix 时间戳的起始时间（1970-01-01 00:00:00 UTC）