fix: bump langchain-core to 0.3.29 (langchain-groq 0.2.3 requires >=0.3.29)

fix: bump pydantic to 2.10.6 (langchain 0.3.7 requires >=2.7.4)

fix: pin all requirements_api.txt versions to stop pip backtracking

feat: full optimization - Groq LLM, disease cache, deploy configs

Push all code to huy_xau_trai repository

Add RAG integration: Flask API server, disease selector, evaluation system with improved case generation