feat: nested folder hierarchy with parent_id, root_only filter, recursive delete

feat: async document processing with BackgroundTasks + thread pool executors

feat: folder management, document move/drag-drop, per-document chat scoping

fix: override decommissioned llama-3.1 model with llama-3.3-70b-versatile

fix: log Groq errors, cap context chunks, hardcode model fallback

fix: update Groq model to llama-3.3-70b-versatile (3.1 deprecated)

fix: add file_content migration + always use DB storage adapter

security: remove .env from tracking, add .gitignore

fix: replace HF bucket storage with DB storage (files stored in Neon PostgreSQL)

fix: clean up storage adapter and pin sentence-transformers to 3.0.1

fix: use HuggingFace Hub API for file uploads

fix: update Dockerfile to use port 7860 and app.py entry point for HF Spaces

fix: hardcode port 7860 for HF Spaces

fix: port 7860 for HF Spaces

feat: upgrade to BGE-M3 multilingual model

fix: update pinecone package name

feat: add Pinecone support

feat: add HF bucket storage support

feat: add Neon and Qdrant Cloud support

fix: make external services optional

update: sync with latest changes

deploy: initial deployment to Hugging Face Spaces