结构调整，便于后续扩展

AIStudio.Wpf.BaseDiagram/Services/IUIVisualizerService.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AIStudio.Wpf.BaseDiagram.Services
+{
+    /// <summary>
+    /// This interface defines a UI controller which can be used to display dialogs
+    /// in either modal form from a ViewModel.
+    /// </summary>
+    public interface IUIVisualizerService
+    {
+        /// <summary>
+        /// This method displays a modal dialog associated with the given key.
+        /// </summary>
+        /// <param name="dataContextForPopup">Object state to associate with the dialog</param>
+        /// <returns>True/False if UI is displayed.</returns>
+        bool? ShowDialog(object dataContextForPopup);
+    }
+}