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/NlogItem.cs

@@ -0,0 +1,29 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using DMS.Core.Models;
+
+namespace DMS.WPF.ItemViewModel;
+
+public class NlogItem : ObservableObject
+{
+    private Nlog _nlog;
+
+    public NlogItem()
+    {
+        _nlog = new Nlog();
+    }
+
+    public NlogItem(Nlog nlog)
+    {
+        _nlog = nlog;
+    }
+
+    public int Id => _nlog.Id;
+    public string Level => _nlog.Level;
+    public string ThreadName => _nlog.ThreadName;
+    public string Callsite => _nlog.Callsite;
+    public string Message => _nlog.Message;
+    public string Logger => _nlog.Logger;
+    public string Exception => _nlog.Exception;
+    public string StackTrace => _nlog.Exception; // Using Exception as StackTrace since it's not in the Nlog model
+    public DateTime TimeStamp => _nlog.LogTime;
+}