fix(rag-api): relax keyword overlap filter + cache DeBERTa intent results

feat: numbered citations [1][2][3], follow-up questions, focus modes

feat: add top stories API + fix reranker tokenizer

feat: integrate Jina Reader for full article extraction (71x content boost)

fix: Improve DuckDuckGo error handling + deployment tools

fix: Remove Qdrant order_by and upgrade reranker dependencies

fix(news): Add time-based filtering and cache-control to /latest endpoint

feat: Add query enhancements and flexible prompting (v2.1)

fix: handle None values in hybrid result deduplication

fix: correct DuckDuckGo API call and database search execution

fix: make _build_context and execute_chat async for hybrid search

fix: use await instead of asyncio.run for hybrid search

fix: add missing logger import in rag_chat_use_case

fix: update to ddgs package and use FastAPI lifespan events

feat(rag): implement hybrid search with live sources and production-grade intent classification