zerogpu: slim requirements (trust base image torch/transformers/gradio/accelerate)

zerogpu: python 3.10.13 (3.11 not supported by spaces CUDA emulation), restore module-level .to(cuda)

zerogpu: python 3.10.13 (3.11 not supported by spaces CUDA emulation), restore module-level .to(cuda)

zerogpu: prefetch shards at import (CPU), load+to(cuda) inside @spaces.GPU

zerogpu: import spaces before torch/gradio to install fake-cuda patches

zerogpu: eager-load backbone at import (.to(cuda)) and shorten GPU slot to 120s

pin python 3.11 (gradio 4.44/pydub needs audioop, gone in py3.13)

initial: round-trip + arithmetic demo on ZeroGPU

initial commit