Deduct open position margin from recommend max lots.

Recalculate tradable symbol budgets from remaining margin after CTP usage and refresh the table on position updates.

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

product_recommend.py

@@ -163,6 +163,7 @@ def assess_product_for_capital(
     trading_mode: str = "simulation",
     ctp_connected: bool = True,
     main_code: str = "",
+    margin_used: float = 0.0,
 ) -> dict:
     """评估单品种在当前资金下是否可交易。"""
     ths = product.get("ths") or ""
@@ -225,6 +226,7 @@ def assess_product_for_capital(
         margin_one = p * mult * margin_rate
     min_capital = margin_one / (margin_pct / 100.0) if margin_pct > 0 else margin_one
     margin_budget = cap * margin_pct / 100.0 if cap > 0 else 0.0
+    margin_budget = max(0.0, margin_budget - max(0.0, float(margin_used or 0)))
     max_lots = int(math.floor(margin_budget / margin_one)) if margin_one > 0 and margin_budget > 0 else 0
     stop_dist = tick * default_stop_ticks
     risk_one_lot = stop_dist * mult
@@ -287,6 +289,7 @@ def list_product_recommendations(
     max_margin_pct: float = 30.0,
     trading_mode: str = "simulation",
     ctp_connected: bool = True,
+    margin_used: float = 0.0,
 ) -> list[dict]:
     """扫描全部品种并排序：可开且纪律友好 > 可开 > 不足。quote_fn(品种代码) -> {price, ths_code, ...}"""
 
@@ -302,6 +305,7 @@ def list_product_recommendations(
                 trading_mode=trading_mode,
                 ctp_connected=ctp_connected,
                 main_code=main_code,
+                margin_used=margin_used,
             )
             row["main_code"] = main_code
             if main_code: