清理运行时的编译警告

- 媒体播放器内部的 Controls 类改名 PlayerControls，不再隐藏 Control.Controls
- DataGridView 的 CellEnter、RowEnter 不触发，标明不报"从不使用"

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

runtime/Sim.WinForms/Forms/AxWindowsMediaPlayer.cs

@@ -69,7 +69,7 @@ namespace AxWMPLib
 
         public AxWindowsMediaPlayer() : base("6bf52a52-394a-11d3-b153-00c04f79faa6")
         {
-            Ctlcontrols = new Controls(this);
+            Ctlcontrols = new PlayerControls(this);
             settings = new Settings();
         }
 
@@ -143,7 +143,7 @@ namespace AxWMPLib
             props["URL"] = _url;
         }
 
-        private sealed class Controls(AxWindowsMediaPlayer owner) : IWMPControls
+        private sealed class PlayerControls(AxWindowsMediaPlayer owner) : IWMPControls
         {
             public void play()
             {