完成设备界面的简单布局，引入GridView的使用，并接GridView的模板抽离成Dictionary

Services/DeviceDialogService.cs

@@ -27,4 +27,9 @@ public class DeviceDialogService : IDeviceDialogService
         }
 
     }
+
+    public void ShowMessageDialog(string title, string message)
+    {
+        MessageBox.Show(message);
+    }
 }

Services/IDeviceDialogService.cs

@@ -5,4 +5,6 @@ namespace PMSWPF.Services;
 public interface IDeviceDialogService
 {
     Task<Device> ShowAddDeviceDialog();
+
+    void ShowMessageDialog(string title, string message);
 }

Services/NavgatorServices.cs

@@ -16,6 +16,7 @@ public class NavgatorServices
         {
             currentViewModel = value; 
             OnViewModelChanged?.Invoke();
+            currentViewModel.OnLoaded();
         }
     }