重构：统一 Moonlight 协议并移除 RDP 选项

变更详情：协议统一 Moonlight，移除 RDP 选项

terminal/kiosk-shell/src/desktop_settings_dialog.h

@@ -39,7 +39,6 @@ private:
     std::vector<DesktopInfo> desktops_;
 
     QComboBox* comboDesktop_ = nullptr;
-    QComboBox* comboProtocol_ = nullptr;
     QLineEdit* editEndpoint_ = nullptr;
     QLineEdit* editApp_ = nullptr;
     QComboBox* comboResolution_ = nullptr;