fix: upgrade torch version to >=2.4.0+cpu to support newer transformers pipeline requirements

perf: optimize package installation and memory footprint for Streamlit Cloud deployment

fix: resolve ProxyConfig load_from_yaml AttributeError in standalone mode

fix: force CPU-only PyTorch index for Streamlit Cloud

feat: implement standalone in-process fallback mode for Streamlit Cloud

fix: separate FastAPI and Streamlit into two independent Railway services