Feature(web): Add toolbar audio toggle button

server/2015Remote/2015RemoteDlg.h

@@ -373,6 +373,7 @@ public:
     void RemoveRemoteWindow(HWND wnd);
     void CloseRemoteDesktopByClientID(uint64_t clientID);
     void CloseWebRemoteDesktopByClientID(uint64_t clientID);  // Only close Web session dialog
+    bool PostWebAudioToggle(uint64_t clientID);               // 给 Web 会话 ScreenSpy 投递音频开关消息
     CDialogBase* m_pActiveSession = nullptr; // 当前活动会话窗口指针 / NULL 表示无
     void UpdateActiveRemoteSession(CDialogBase* sess);
     CDialogBase* GetActiveRemoteSession();