added features

Align 500MB upload limits and stream large files

Relax Streamlit proxy checks for Spaces

Prepare Hugging Face Spaces deployment

Replace Python proxy with Nginx to support Streamlit WebSockets and fix blank screen

Fix 403 error: Unify deployment on port 7860 using FastAPI reverse proxy for Streamlit

Optimize for HF Spaces: Robust start.sh, Celery worker, and permissions

Fix NumPy 2.x compatibility: pin numpy<2 for SHAP compatibility

Add Streamlit frontend to deployment: run both backend and frontend together