AI-Powered Internal Knowledge Base Creation

I am looking to build an AI-powered internal knowledge base or “Company Second Brain.” The system should capture organizational knowledge from meeting transcripts, SOPs, documents, ERP notes, emails, PDFs,... (Budget: ₹1500 - ₹12500 INR, Jobs: AI Development, Data Management, Database Management, PHP, Retrieval-Augmented Generation (RAG), Software Architecture, UML Design)