Feature: Migrate SimplePlugins drawing board (远程画板迁移)

Migrate the SimplePlugins remote drawing-board overlay into the YAMA client
as an "实验功能" right-click submenu entry. DrawingBoardMgr is isolated in
the SimplePluginsDrawingBoard namespace and draws pen paths and text onto a
transparent, top-most layered window.

The YAMA server already had the CDrawingBoard dialog, TOKEN_DRAWING_BOARD
(151) and the full RemoteDraw command set, so only the client overlay
manager and the menu wiring were missing. Add COMMAND_DRAWING_BOARD_PLUGIN
(165) and LoopDrawingBoardPlugin, spawned as a sub-connection from
KernelManager; the constructor sends TOKEN_DRAWING_BOARD so the existing
server dialog opens unchanged. Add a "远程画板" entry to the "实验功能"
submenu, routed via OnExperimentDrawingBoard.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015RemoteDlg.cpp

@@ -998,6 +998,7 @@ BEGIN_MESSAGE_MAP(CMy2015RemoteDlg, CDialogEx)
     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_EXPERIMENT_DRAWING_BOARD, &CMy2015RemoteDlg::OnExperimentDrawingBoard)
     ON_COMMAND(ID_TRIGGER_SETTINGS, &CMy2015RemoteDlg::OnTriggerSettings)
     ON_COMMAND(ID_SHELLCODE_AES_C_ARRAY, &CMy2015RemoteDlg::OnShellcodeAesCArray)
     ON_COMMAND(ID_PARAM_KBLOGGER, &CMy2015RemoteDlg::OnParamKblogger)
@@ -4525,6 +4526,12 @@ void CMy2015RemoteDlg::OnExperimentPrivateScreen()
     SendSelectedCommand(&bToken, sizeof(BYTE));
 }
 
+void CMy2015RemoteDlg::OnExperimentDrawingBoard()
+{
+    BYTE bToken = COMMAND_DRAWING_BOARD_PLUGIN;   //向被控端发送打开远程画板命令
+    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,