Agnostic RAG system for full control on security and privacy

Hi everyone, I’ve been working on a RAG (Retrieval-Augmented Generation) implementation where the core goal is total modularity. I wanted a system that doesn't care which LLM or Vector you use, allowing a seamless switch between local models (for privacy) and cloud APIs (for power) without refactoring the core logic. I used my own RAD (Rapid Application Development) methodology to keep it lean. I’m curious to get some architectural feedback from this community. The Stack: Orchestration: n8n (This is the "brain" that makes it provider-agnostic.