dsh-approval-voice: Add voice reminder to DSH Web GUI approval popup

dsh-approval-voice is a community plugin for DSH Web GUI (licensed under MIT). It plays a high-pitched alert tone and performs Chinese text-to-speech (TTS) when approval or inquiry popups appear, helping users avoid missing requests caused by looking away from the page. The plugin monitors specific DOM markers (such as `data-approval-key`) and utilizes the SpeechSynthesis API to provide voice alerts, supporting a reminder only once per request. Users can adjust the toggle switch, volume, and test the audio via the settings interface, with configurations saved in the browser's `localStorage`. Installation requires executing the `dsh plugin add` command and restarting the service. It supports installation from remote repositories or local links and allows for debugging via the console interface. The plugin relies on the Chinese TTS voice installed on the system; if no Chinese [voice]...