清理引用，将NavigatorServices更改为使用Message来实现导航的切换

Views/VariableTableView.xaml.cs

@@ -0,0 +1,13 @@
+using System.Windows.Controls;
+using PMSWPF.ViewModels;
+
+namespace PMSWPF.Views;
+
+public partial class VariableTableView : UserControl
+{
+    public VariableTableView(VariableTableViewModel viewModel)
+    {
+        InitializeComponent();
+        DataContext = viewModel;
+    }
+}