Configure Option 3 decoupled Vercel deployment with API rewrites and dynamic URL resolution

Clean up obsolete Streamlit files, scratch test scripts, and update dependencies

Route Streamlit UI queries to live Railway backend API

fix: Add safe response handling and error alerts for text and voice queries in web UI

feat: Add full 4-hero Avengers V-Formation animation engine and sprite endpoints

feat: Update UI component label to Evaluation Matrix

feat: Add VisionQuest Indic RAG core services, vector search, safety guardrails & web UI