refactor:将所有的ItemViewMdoel的名字删除ViewModel，并将命名空间调整为DMS.WPF.ItemViewModel.

DMS.WPF/ItemViewModel/MqttServerItem.cs

@@ -0,0 +1,68 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using DMS.Application.DTOs;
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+
+namespace DMS.WPF.ItemViewModel;
+
+public partial class MqttServerItem : ObservableObject
+{
+    public int Id { get; set; }
+
+    [ObservableProperty]
+    private string _serverName;
+
+    [ObservableProperty]
+    private string _serverUrl;
+
+    [ObservableProperty]
+    private int _port;
+
+    [ObservableProperty]
+    private string _username;
+
+    [ObservableProperty]
+    private string _password;
+
+    [ObservableProperty]
+    private bool _isActive;
+    
+    [ObservableProperty]
+    private bool _isConnect;
+
+    [ObservableProperty]
+    private string _subscribeTopic;
+
+    [ObservableProperty]
+    private string _publishTopic;
+
+    [ObservableProperty]
+    private string _clientId;
+
+    [ObservableProperty]
+    private DateTime _createdAt;
+
+    [ObservableProperty]
+    private DateTime? _connectedAt;
+
+    [ObservableProperty]
+    private long _connectionDuration;
+
+    [ObservableProperty]
+    private string _messageFormat;
+
+    [ObservableProperty]
+    private string _messageHeader;
+
+    [ObservableProperty]
+    private string _messageContent;
+
+    [ObservableProperty]
+    private string _messageFooter;
+
+    [ObservableProperty]
+    private ObservableCollection<MqttAliasItem> _variableAliases = new();
+
+
+}