Fix ImportError: _AUDIO_EXTS imported from wrong module in routes/stt.py

_AUDIO_EXTS lives in core.voice, not core.audio. The dead alias
'_VOICE_AUDIO_EXTS' was never used anywhere in the file.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -9,6 +9,12 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 
 ### Fixed
 
+- **`ImportError: cannot import name '_AUDIO_EXTS' from 'core.audio'`** —
+  `routes/stt.py` had a dead alias `from core.audio import _to_wav_16k, _AUDIO_EXTS as _VOICE_AUDIO_EXTS`;
+  `_AUDIO_EXTS` lives in `core.voice`, not `core.audio`. Removed the
+  wrong import; `_AUDIO_EXTS` is already correctly imported from `core.voice`
+  on the next line and the unused alias was never referenced in the file.
+
 - **`No module named 'core'` on container restart** — `docker restart` reuses
   the old container configuration and never applies new volume mounts from
   `docker-compose.yml`. Added a comment to `portainer-stack.yml` and updated

routes/stt.py

@@ -17,7 +17,7 @@ from core.constants import (
 )
 from core.registry import _registry_get, TEMP_DIR
 from core.validation import _validate_http_url, _copy_limited
-from core.audio import _to_wav_16k, _AUDIO_EXTS as _VOICE_AUDIO_EXTS
+from core.audio import _to_wav_16k
 from core.voice import _AUDIO_EXTS, _UPLOAD_EXTS
 
 router = APIRouter()