Sell residual options at latest bid via IOC limit, not market.

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

backend/app/live/binance_trade.py

@@ -201,6 +201,35 @@ class BinanceTradeClient:
         data = self._signed(self._eapi, "POST", "/eapi/v1/order", params)
         return self._fill_from_eapi(symbol, data)
 
+    def place_option_ioc(
+        self,
+        *,
+        symbol: str,
+        side: str,  # BUY|SELL
+        quantity: float,
+        price: float,
+        reduce_only: bool = False,
+    ) -> LiveFill:
+        """期权限价 IOC：按买一/卖一价吃单，未成交部分取消。"""
+        qty = str(int(round(quantity)))
+        if qty == "0":
+            qty = "1"
+        px = f"{float(price):.8f}".rstrip("0").rstrip(".")
+        if not px or px == "0":
+            raise RuntimeError("币安期权 IOC 价格无效")
+        params: dict[str, Any] = {
+            "symbol": symbol,
+            "side": side.upper(),
+            "type": "LIMIT",
+            "timeInForce": "IOC",
+            "quantity": qty,
+            "price": px,
+        }
+        if reduce_only:
+            params["reduceOnly"] = "true"
+        data = self._signed(self._eapi, "POST", "/eapi/v1/order", params)
+        return self._fill_from_eapi(symbol, data)
+
     def _fill_from_eapi(self, symbol: str, data: dict[str, Any]) -> LiveFill:
         ord_id = str(data.get("orderId") or data.get("id") or "")
         avg = safe_float(data.get("avgPrice")) or safe_float(data.get("price"))