Use persistent /workspace for checkpoint cache if available

Configure Model Hub repo IDs and add setup guide

Update requirements.txt with huggingface_hub

Add Model Hub support for downloading checkpoints (solves 1GB storage limit)

Add ckpts folder to gitignore

Update app.py to support persistent checkpoints

Add requirements.txt for HF Spaces

Update Gradio to latest version

Add README.md with HF Spaces configuration

Initial commit for HF Space - code files only