给DialogService从原来的接口注入，更改为RequestMessage消息通知

Message/DialogMessage.cs

@@ -0,0 +1,9 @@
+namespace PMSWPF.Message;
+
+public class DialogMessage
+{
+    public bool IsCancel { get; set; }
+    public bool IsConfirm { get; set; }
+    public Object? Request { get; set; }
+    public Object? Response { get; set; }
+}