pin gradio==5.15.0 — 5.0.0 still has the gradio_client schema bug

pin huggingface_hub<1.0 (Gradio 5 OAuth still imports HfFolder)

upgrade to Gradio 5.x to fix client utils schema bug

fix py3.13 audioop dep: pin python_version=3.12 + audioop-lts

initial Space