fix(lotto): curator_helpers 시그니처 정합 (recommender/analyzer/strategy_evolver 실제 시그니처에 맞춤)

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

backend/app/purchase_manager.py

@@ -102,13 +102,15 @@ def check_purchases_for_draw(drw_no: int) -> int:
 def get_recent_performance(limit: int = 3) -> list:
     """최근 N회차 내 구매 성과 요약. 없으면 빈 리스트."""
     from . import db
-    purchases = db.get_purchases(days=None) or []
+    purchases = db.get_purchases() or []
     by_draw: dict = {}
     for p in purchases:
         d = p.get("draw_no")
         if not d:
             continue
-        by_draw.setdefault(d, {"draw_no": d, "purchased_sets": 0, "best_match": 0})
-        by_draw[d]["purchased_sets"] += int(p.get("sets") or 1)
-        by_draw[d]["best_match"] = max(by_draw[d]["best_match"], int(p.get("correct_count") or 0))
+        results = p.get("results") or []
+        max_correct = max((int(r.get("correct") or 0) for r in results), default=0)
+        slot = by_draw.setdefault(d, {"draw_no": d, "purchased_sets": 0, "best_match": 0})
+        slot["purchased_sets"] += int(p.get("sets") or 1)
+        slot["best_match"] = max(slot["best_match"], max_correct)
     return sorted(by_draw.values(), key=lambda x: -x["draw_no"])[:limit]