fix(audio): notify when virtual sink is restored

[qiin2333]

改了啥喵

• Added a generic system tray notification helper for short runtime explanations outside the Web UI.
• When Windows default playback changes during a stream that is using a virtual audio sink, Sunshine still restores the assigned virtual sink, but now explains why with a tray notification.
• Rate-limited the notification to once every 30 seconds so Windows role updates do not spam the user.

为啥要改

The real hard-control scenario is host audio streaming with a virtual sink, not VB-Cable microphone redirection. If Sunshine selected a virtual audio device for host audio streaming, Windows playback changes are restored back to that virtual sink so capture/muting behavior keeps working. Users can hit that from the Windows audio switcher and otherwise only see the device jump back.

This puts the explanation at the moment the user actually hits the behavior, without implying that VB-Cable mic redirection needs to lock the default speaker.

验证

• git diff --check
• npm run build
• cmake --build build --target sunshine --config RelWithDebInfo -j 1 -v was attempted, but the local build stops before these changes at third-party/moonlight-common-c/enet/callbacks.c with cc.exe returning code 1 and no compiler diagnostic in the Ninja output.

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