fix(spaces): pin torchaudio==2.10.0 to match HF base torch

HF Spaces' base image pre-installs torch==2.10.0. Our previous bare
'torchaudio' constraint let pip resolve to e.g. 2.5.x whose
_torchaudio.abi3.so was built against torch 2.5's C++ ABI — load
crashes at runtime. Cascade: comfyui/comfy/ldm/lightricks/vae/audio_vae.py
fails to import, ComfyUI-LTXVideo can't register, workflow's
LTXVAudioVAEDecode missing → KeyError on Generate.

requirements.txt

@@ -5,7 +5,10 @@ psutil  # used by app.py model status badge
 
 torch>=2.4.0
 torchvision
-torchaudio
+# HF Spaces ships torch==2.10.0; bare 'torchaudio' lets pip pick an older
+# wheel whose C++ ABI doesn't match → import crashes the whole audio code
+# path including ComfyUI-LTXVideo's audio VAE. Pin the matching version.
+torchaudio==2.10.0
 numpy
 Pillow
 einops