fix: Return JSON string to avoid Gradio schema issues

Add ZeroGPU decorator for GPU function detection

Pin huggingface_hub version for gradio compatibility

Simplify requirements - minimal deps

Remove model folder - use fallback mode

Upload app.py with huggingface_hub

Upload folder using huggingface_hub

Upload folder using huggingface_hub

Upload folder using huggingface_hub

Upload folder using huggingface_hub

initial commit