Desktop: route STT through backend /v4/listen, remove DEEPGRAM_API_KEY#5395

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beastoin wants to merge 8 commits intomainfrom

fix/desktop-stt-backend-5393

Commits on Mar 10, 2026

Add BackendTranscriptionService for /v4/listen WebSocket

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Add mono output mode and fix single-source operation in AudioMixer

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Switch BleAudioService to closure-based audio sink

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Route desktop STT through backend /v4/listen in AppState

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Use BackendTranscriptionService for push-to-talk

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Remove old transcriptionService parameter from AudioSourceManager

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Remove DEEPGRAM_API_KEY from desktop .env.example

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Add changelog entry for backend STT migration

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