Label night-session products and hide day-only symbols at night.

Mark tradable varieties with a night tag; during 21:00-02:30 filter out index futures and other products without night sessions from symbol picker and recommend list.

Co-authored-by: Cursor <cursoragent@cursor.com>

product_recommend.py

@@ -14,7 +14,7 @@ from typing import Callable, Optional
 from contract_specs import get_contract_spec
 from fee_specs import calc_fee_breakdown
 from recommend_trend import analyze_product_daily, sort_recommend_by_trend
-from symbols import PRODUCTS, product_category
+from symbols import PRODUCTS, product_category, product_has_night_session
 
 logger = logging.getLogger(__name__)
 
@@ -74,6 +74,7 @@ def assess_product_for_capital(
             "margin_one_lot": None,
             "max_lots": 0,
             "risk_one_lot_1pct": None,
+            "has_night_session": product_has_night_session(product),
         }
 
     margin_one = p * mult * margin_rate
@@ -125,6 +126,7 @@ def assess_product_for_capital(
         "roundtrip_fee_one_lot": fee_info["total_fee"],
         "status": status,
         "status_label": label,
+        "has_night_session": product_has_night_session(product),
     }
 
 
@@ -167,6 +169,7 @@ def list_product_recommendations(
                 "status_label": "计算失败",
                 "main_code": "",
                 "max_lots": 0,
+                "has_night_session": product_has_night_session(product),
             }
 
     with ThreadPoolExecutor(max_workers=10) as pool: