feat: add Tavily as parallel search provider option in backend#208

tavily-integrations wants to merge 1 commit intogoogle-gemini:maingoogle-gemini/gemini-fullstack-langgraph-quickstart:mainfrom

Tavily-FDE:feat/tavily-migration/backend-google-searchTavily-FDE/autopr--fork-gemini-fullstack-langgraph-quickstart:feat/tavily-migration/backend-google-searchCopy head branch name to clipboard