- Fix voice clone preview saved as .wav regardless of actual format (MP3/WebM
content from WaveSpeed was saved with .wav extension causing NotSupportedError)
- Add detect_audio_format() and ensure_audio_extension() to media_utils
- Fix assets_serving.py: use storage_paths for root resolution, add proper
MIME types to FileResponse, add auth via query token for <audio> elements
- Fix assets_serving.py: add path traversal security check
- Fix step4_asset_routes.py: use get_user_workspace() instead of WORKSPACE_DIR,
detect actual audio format before saving preview
- Fix get_db() in database.py: raise HTTPException(401) instead of raw Exception,
catch engine creation failures with HTTPException(503)
- Fix avatar.py: add auth error handling, diagnostic logging for path resolution,
graceful DB save degradation
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