* feat: embed STT transcription in audio event content
Before sending the audio event, the client now fetches the STT
transcript first, then embeds it under 'user_stt' in the event
content. This mirrors the 'original_sent' pattern for text messages
and lets the bot read the transcript immediately without downloading
audio or calling choreo.
- Add ModelKey.userStt constant
- Rewrite onVoiceMessageSend to get transcript before sending audio
- Update getSpeechToTextLocal() to check userStt before botTranscription
* chore: replace inaccurate comment with TODO referencing #5730
* formatting
* fix pangea comments
* feat: make stt translations relate to pangea message events instead of stt representation events
* clean up pangea event types
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Co-authored-by: ggurdin <ggurdin@gmail.com>
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