upgrade to gradio 5.x (no pinned sdk_version), drop hub pin

fix: pin huggingface_hub<1.0 for gradio 4.44 compat

fix: use audioop-lts (official Python 3.13 audioop replacement)

try minimal requirements (no pyaudioop)

fix: remove gradio from requirements (SDK pins it), keep only extras

fix: add pyaudioop for Python 3.13 audioop removal

edgebench: cross-model + quant-sweep Gradio app

initial commit