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/OpcUaNodeItem.cs

@@ -0,0 +1,52 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using DMS.Infrastructure.Models;
+using Opc.Ua;
+using System.Collections.ObjectModel;
+
+namespace DMS.WPF.ItemViewModel
+{
+    /// <summary>
+    /// OPC UA节点的视图模型。
+    /// </summary>
+    public partial class OpcUaNodeItem : ObservableObject
+    {
+
+        [ObservableProperty]
+        private NodeId? _nodeId;
+
+        [ObservableProperty]
+        private string? _displayName;
+
+        [ObservableProperty]
+        private NodeClass _nodeClass;
+
+        [ObservableProperty]
+        private object? _value;
+
+        [ObservableProperty]
+        private string? _dataType;
+
+        [ObservableProperty]
+        private OpcUaNodeItem? _parentNode;
+
+        [ObservableProperty]
+        private ObservableCollection<OpcUaNodeItem> _children = new ObservableCollection<OpcUaNodeItem>();
+
+        [ObservableProperty]
+        private bool _isExpanded;
+
+        [ObservableProperty]
+        private bool _isSelected;
+
+        /// <summary>
+        /// 默认构造函数（用于设计时支持）。
+        /// </summary>
+        public OpcUaNodeItem()
+        {
+            // 设计时数据支持
+           
+        }
+        
+      
+    }
+}