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Adds dictation support using OpenAI's Realtime API over WebRTC:
Relay:
- New /transcribe/status and /transcribe/session endpoints
- BUZZ_OPENAI_API_KEY env var gates the feature (hidden when absent)
- Proxies ephemeral client-secret minting from OpenAI
Desktop:
- New features/dictation module with:
- AudioWorklet for 24kHz PCM capture + buffering
- WebRTC peer connection to OpenAI Realtime API
- Real-time transcript merging into composer
- Auto-submit on trigger phrase ('submit')
- Mic button in composer toolbar (red pulse when recording)
- Integrated into MessageComposer via useComposerDictation hook
Signed-off-by: klopez4212 <klopez4212@gmail.com>