lotto-lab: checker 연동 — 추첨 결과 시 purchase 자동 체크 + 가중치 재계산

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/checker.py

@@ -62,5 +62,15 @@ def check_results_for_draw(drw_no: int) -> int:
         
         update_recommendation_result(r["id"], rank, correct, has_bonus)
         count += 1
-        
+
+    # ── 구매 이력 체크 연동 ──────────────────────────────────────
+    try:
+        from .purchase_manager import check_purchases_for_draw as _check_purchases
+        purchase_count = _check_purchases(drw_no)
+        if purchase_count > 0:
+            from .strategy_evolver import recalculate_weights
+            recalculate_weights()
+    except ImportError:
+        pass  # purchase_manager 미설치 시 무시 (하위호환)
+
     return count