feat: hybrid RAG pipeline upgrade

feat: enhance DuckDuckGo live search with smart Ethiopia filtering

fix(3-bugs): Jina 401, reranker tokenizer, intent classifier v1 still running

feat(intent): add 4-provider fallback chain for intent classification

feat(rag-api): hybrid top stories — 3 from Kafka news.processed + 3 from DuckDuckGo

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

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