- Added hard_patterns.py: detect patterns (cheaper_than, more_expensive_than, similar_to) and extract reference product
- product_search_engine.py: integrate pattern detection, auto-set price_max/min based on reference price
- lead_search_tool.py: added user_insight parameter
- graph.py: pass user_insight to tool, removed product_ids filter (always return full tool result)
- prompts.py: added family/group intent examples, emphasize product_ids must include all items
- stylist_engine.py: added occasion and rule_id to matches, save to DB properly
- Added scripts: regenerate_matches.py and test_insert_one.py

Impact:
- Query 'rẻ hơn' auto sets price_max = ref_price * 0.95
- Query 'đắt hơn' auto sets price_min = ref_price * 1.05
- UI receives complete product list from tool (not truncated by AI)