Resolve test_cases.json path dynamically for cross-platform compatibility

Fix Streamlit UI startup hang by adding request timeouts

Fixed hardcoded workspace paths and disabled Streamlit CORS/XSRF for HF iframe support

Added Hugging Face Spaces metadata frontmatter to README.md

Added root Dockerfile and start.sh for unified hosting

Initial commit: Plum OPD Claim Adjudication Engine with Hybrid Decision Pipeline