=== 附件D: KWin /BlackScreen D-Bus 接口探测输出 ===
命令: busctl --user introspect org.kde.KWin /BlackScreen

输出:
Failed to introspect object /BlackScreen of service org.kde.KWin: No such object path '/BlackScreen'

补充验证:
- find /usr -iname "*blackscreen*" 2>/dev/null
  仅找到: /usr/share/dbus-1/services/org.deepin.dde.BlackScreen1.service (dde-blackwidget, 非 KWin 接口)
- ls /usr/lib/x86_64-linux-gnu/kwin/plugins/ | grep -i black  → 无输出
- ls /usr/share/kwin/scripts/ → closewindowaction/ddelaunchpad/ddeshortcuts/desktopchangeosd/gtkframe/minimizeall/runcommandaction/synchronizeskipswitcher/videowall (无 blackscreen)
- dpkg -L dde-kwin | grep -i black → 无输出

结论: 系统中 KWin (kwin-x11 4:6.1.38) 未注册 /BlackScreen 对象，亦无任何黑屏相关插件/脚本文件。
