feat: implement 'latest=3 days' logic and Jina content date extraction

feat: detailed step-by-step pipeline logging

feat: hybrid RAG pipeline upgrade

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

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

fix: correct DuckDuckGo API call and database search execution

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