Remove torch/torchvision: use ZeroGPU pre-installed version

Pin torch==2.8.0 and torchvision==0.23.0 (known working versions)

Restore torch/torchvision without version pin

Remove torch/torchvision from requirements to avoid ZeroGPU conflicts

Fix gradio version, model repo, and remove rmbg-v2

Fix huggingface_hub version incompatibility with gradio

Add README.md for HuggingFace Space and requirements.txt