fix(mcp): add explicit VECTOR_DB_TYPE=milvus handling to prevent fallback to FAISS#63

amondnet wants to merge 3 commits intomainpleaseai/context-please:mainfrom

62-bug-vector_db_typemilvus-ignored-mcp-uses-faiss-despite-correct-configurationpleaseai/context-please:62-bug-vector_db_typemilvus-ignored-mcp-uses-faiss-despite-correct-configurationCopy head branch name to clipboard