区间打分根据用户选择日期自动判断主力合约，放宽前端日期限制支持历史区间

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tushare/src/api.py

@@ -47,7 +47,8 @@ def health():
 
 @app.post("/api/v1/run", response_model=RunResponse)
 def run_pipeline(req: RunRequest):
-    ts_code = req.ts_code or contracts.active_contract(req.symbol)
+    ref_date = datetime.strptime(req.trade_date, "%Y%m%d").date() if req.trade_date else None
+    ts_code = req.ts_code or contracts.active_contract(req.symbol, ref_date)
     if not req.ts_code:
         print(f"[AUTO] {req.symbol} 当月主力 -> {ts_code}")
 
@@ -97,10 +98,10 @@ def run_batch():
 @app.post("/api/v1/run/range")
 def run_range(req: RunRangeRequest):
     """对指定日期区间内的每一天分别打分。"""
-    ts_code = contracts.active_contract(req.symbol)
+    start_dt = datetime.strptime(req.start_date, "%Y%m%d").date()
+    ts_code = contracts.active_contract(req.symbol, start_dt)
 
     # 为确保区间开始日有足够前置数据,拉取时 start_date 前推 60 天
-    start_dt = datetime.strptime(req.start_date, "%Y%m%d")
     fetch_start = (start_dt - timedelta(days=60)).strftime("%Y%m%d")
 
     df = fetcher.fetch_contract(ts_code, start_date=fetch_start, end_date=req.end_date)