feat: auto-sync full lotto history on stats api access

backend/app/main.py

@@ -10,7 +10,8 @@ from .db import (
     update_recommendation,
 )
 from .recommender import recommend_numbers
-from .collector import sync_latest
+from .recommender import recommend_numbers
+from .collector import sync_latest, sync_ensure_all
 
 app = FastAPI()
 scheduler = BackgroundScheduler(timezone=os.getenv("TZ", "Asia/Seoul"))
@@ -118,6 +119,10 @@ def admin_sync_latest():
 
 @app.get("/api/lotto/stats")
 def api_stats():
+    # 1. 데이터 완전성 보장 (없으면 가져옴)
+    sync_ensure_all(LATEST_URL, ALL_URL)
+    
+    # 2. 전체 데이터 조회
     draws = get_all_draw_numbers()
     if not draws:
         raise HTTPException(status_code=404, detail="No data yet")