feat(lmxproxy): add Connected Since and Reconnect Count to status page

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lmxproxy/src/ZB.MOM.WW.LmxProxy.Host/Domain/IScadaClient.cs

@@ -16,6 +16,12 @@ namespace ZB.MOM.WW.LmxProxy.Host.Domain
         /// <summary>Gets the current connection state.</summary>
         ConnectionState ConnectionState { get; }
 
+        /// <summary>Gets the UTC time when the current connection was established.</summary>
+        DateTime ConnectedSince { get; }
+
+        /// <summary>Gets the number of times the client has reconnected since startup.</summary>
+        int ReconnectCount { get; }
+
         /// <summary>Occurs when the connection state changes.</summary>
         event EventHandler<ConnectionStateChangedEventArgs> ConnectionStateChanged;