fix: return actual audio data (numpy) from ZeroGPU function instead of file paths to ensure Gradio receives the content before the worker environment is destroyed
fix: move all output and storage directories from /tmp to local app subdirectories to fix Gradio serving issues on HF; explicitly allow results/checkpoints paths; set Audio type to filepath
fix: consolidate Demucs+SeedVC+Mix into single @spaces.GPU function to fix ZeroGPU nested GPU call error; expose _separate_audio_impl; add libsox-dev to packages.txt