feat: implement Groq LLM integration and MessageBubble component with markdown rendering and token display

feat: add retrieval evaluation pipeline with frontend dashboard, backend metrics calculation, and chunking ablation script

feat: persistent question caching and track token usage

feat: implement backend chat streaming route and frontend chat interface with RAG integration

feat: initialize chat frontend with stream-based chat window and message UI components

fix: streaming chat response logic and shared interface definitions

feat: implement streaming RAG chat endpoint and frontend integration with Groq LLM

feat: implement BM25 search index and integrate chat interface with document management API

fix: ChromaDB vector store integration with document management API and frontend upload UI

feat: add PdfUploader component for file uploads and status tracking

feat: initialize frontend project and implement PDF upload functionality with React Query

feat: initialize frontend project with chat, document list, and evaluation panels

feat: initialize frontend project with React, Vite, Tailwind CSS, and shadcn/ui components

feat: initialize project scaffolding with hybrid RAG pipeline and frontend UI structure