feat: add auth-gated 3-mode workflow with admin chroma controls

Implemented Compare feature and fixed other chunking strats

Fixed Chat function bugs and internal bugs related to UI

feat: all phases complete, real backend data working

Implemented Fully Functioning Semantic and Fixed_size chunking strats with a change in RAG Pipeline

Major Bug Fixes and Implemented a Base RAG Workflow

fix: wire wizard to real backend API, fix routing

fix: embedding step selection and remove dims display

feat: phase 3 config wizard skeleton complete