Add deployment solution: FastAPI/uvicorn + Render config + deployment guides

fix: loosen pydantic and google-generativeai bounds for python 3.14 compatibility

fix: loosen dependency versions and revert invalid vercel.json config to allow python 3.14 wheel resolution

chore: Update Python version and dependencies

Fix Vercel deployment: Use proper serverless handler and streamline dependencies

Update faiss-cpu to 1.8.0 for Python 3.12 compatibility

first commit