feat: real-data dataset enrichment + nearby_attractions + travel_tips intents

feat: MapCard zoom controls + multi-marker, nav icon fix, destination_info intent + DestinationInfoCard component

feat(ML): add show_map intent + context-aware map routing

Wave 3: expand NER fixture 85->102, time_preference F1 0.40->0.98, people/duration fixes

Wave 2: compare_destinations data + NER fixes + evaluation update

eval(chatbot): Wave 1 retrain + held-out evaluation results

fix: dataset cleanup, 12 bug fixes, KB expansion (v3.1.0)

fix(chatbot): resolve 7 critical issues - KB expansion, pipeline fixes, dynamic responses

feat: integrate chatbot ML service with backend and frontend