fix(lotto): Phase 3 리뷰 반영 (run-forward 백그라운드·review 404·track_record distinct·테스트 보강)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lotto/app/main.py

@@ -49,6 +49,7 @@ from .routers import briefing as briefing_router
 from .routers import review as review_router
 from .routers import backtest as backtest_router
 from .jobs.grade_weekly_review import run_for_latest as grade_run_for_latest
+from . import backtest
 
 app = FastAPI()
 install_access_log(app)
@@ -86,9 +87,8 @@ def on_startup():
             _refresh_perf_cache()  # 새 채점 결과 반영 → 즉시 갱신
             # 자가학습 백테스트 — 새 회차 forward 구매 + 당첨조합 캘리브레이션
             try:
-                from . import backtest as _backtest
-                _backtest.run_forward_purchase(draw_no=res["drawNo"])
-                _backtest.calibrate_winner(res["drawNo"])
+                backtest.run_forward_purchase(draw_no=res["drawNo"])
+                backtest.calibrate_winner(res["drawNo"])
             except Exception as e:
                 logger.warning(f"backtest 갱신 실패: {e}")