feat(RAG): integrating web-search and vector databse

[EncHawk]

1. This issue is to enhance rag, including a web-search with parallel ai's webseach api here

2. Besides the lookout for a singleton databse with row level security for each user is easier to maintain and is a step up in scaling compared to chroma db instance loaclly. neon, supabase being potential options for pg-vector db's

...more changes to be included here.