chore: add production essentials

feat: enhance production environment settings, improve PDF upload handling, and optimize model loading

feat(rag): implement multilingual retrieval pipeline with HyDE, hybrid search, reranking, and reasoning

feat: Update configuration and enhance chunking strategy for ResearchRAG

Refactor database interactions to support user-specific collections and enhance PDF and OpenAlex ingestion processes

Add initial project structure with Docker, Streamlit app, and core functionality