Cosmetic tweaks

Fix Blackwell support: pin numpy<2, install stable-audio-tools --no-deps, fall back to SDPA

Update app.py

Update requirements.txt

Update app.py

Update requirements.txt

Update requirements.txt

Update requirements.txt

Update requirements.txt

Update requirements.txt

swap torchaudio -> soundfile (avoid libcudart.so.12 load failure)

install flash-attn + stable-audio-tools at startup (SKIP_CUDA_BUILD)

pin PyWavelets>=1.7 for NumPy 2.x ABI

initial commit: SA3 medium + small-music + small-sfx

initial commit