修复IDE0044警告：将未使用的温度数据相关字段设置为只读

Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs

@@ -264,8 +264,8 @@ namespace JoyD.Windows.CS.Toprie
         
         // 温度数据接收相关字段
         private Thread _temperatureReceiveThread;
-        private TcpClient _temperatureTcpClient;
-        private NetworkStream _temperatureStream;
+        private readonly TcpClient _temperatureTcpClient;
+        private readonly NetworkStream _temperatureStream;
         private bool _isReceivingTemperatureData = false;
         private bool _isTemperatureReceivingPaused = false; // 暂停标志，用于控制是否处理接收到的温度数据
         private ManualResetEvent _stopTemperatureEvent;