清理市场概览残留与 refresh_policy 中的 marketOverview 条目

web/services/market_overview_api.py

@@ -9,11 +9,9 @@ import time
 from datetime import datetime
 from typing import Any, Dict, List, Optional
 
-from src.utils.refresh_policy import MARKET_OVERVIEW_TTL_SEC
-
 _OVERVIEW_CACHE: Dict[str, Dict[str, Any]] = {}
 _OVERVIEW_CACHE_LOCK = threading.Lock()
-OVERVIEW_CACHE_TTL_SEC = MARKET_OVERVIEW_TTL_SEC
+OVERVIEW_CACHE_TTL_SEC = 600
 
 
 def _safe_float(value: Any) -> Optional[float]:

web/services/scan_api.py

@@ -7,7 +7,6 @@ from typing import Any, Dict
 from fastapi import HTTPException, Request
 from fastapi.concurrency import run_in_threadpool
 
-from web.services.market_overview_api import build_market_overview_payload
 import web.routes as legacy_routes