Fix #1118: Crash on startup: AttributeError: torchaudio.list_audio_back

[danielalanbates]

Fixes #1118

Summary

This PR fixes: Crash on startup: AttributeError: torchaudio.list_audio_backends (TorchAudio 2.9 removal)

Changes

fish_speech/inference_engine/reference_loader.py | 14 ++++++++++----
 tools/vqgan/extract_vq.py                        | 15 ++++++++++-----
 2 files changed, 20 insertions(+), 9 deletions(-)

Testing

Please review the changes carefully. The fix was verified against the existing test suite.

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This PR was created with the assistance of Claude Sonnet 4.6 by Anthropic | effort: low. Happy to make any adjustments!