fix: background upload to avoid HF proxy timeout on large OCR PDFs

fix: add auth diagnostics, fix CORS origins, show 401 error detail

fix: delete by IDs to avoid ChromaDB compound-filter bug, show trash icon

feat: add JWT auth, per-user document isolation, and delete endpoint

feat: Update API_BASE configuration and add Docker support

feat: Implement Notebook functionality with tabbed interface and document summarization

Initial commit: Production-Grade RAG with Hybrid Search, Re-ranking and React UI