Harden residual mid-close: IOC partial fills, exchange reconcile, atomic book.

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

backend/app/live/binance_trade.py

@@ -228,9 +228,11 @@ class BinanceTradeClient:
         if reduce_only:
             params["reduceOnly"] = "true"
         data = self._signed(self._eapi, "POST", "/eapi/v1/order", params)
-        return self._fill_from_eapi(symbol, data)
+        return self._fill_from_eapi(symbol, data, allow_partial=True)
 
-    def _fill_from_eapi(self, symbol: str, data: dict[str, Any]) -> LiveFill:
+    def _fill_from_eapi(
+        self, symbol: str, data: dict[str, Any], *, allow_partial: bool = False
+    ) -> LiveFill:
         ord_id = str(data.get("orderId") or data.get("id") or "")
         avg = safe_float(data.get("avgPrice")) or safe_float(data.get("price"))
         sz = safe_float(data.get("executedQty")) or safe_float(data.get("quantity"))
@@ -251,16 +253,25 @@ class BinanceTradeClient:
                 if avg and avg > 0 and st == "FILLED":
                     break
                 if st in ("CANCELED", "REJECTED", "EXPIRED"):
+                    if allow_partial and sz and sz > 1e-12 and avg and avg > 0:
+                        break
                     raise RuntimeError(f"币安期权订单失败 status={st} {q}")
                 if st == "PARTIALLY_FILLED":
                     continue
         if not avg or avg <= 0:
             raise RuntimeError(f"币安期权无成交均价 orderId={ord_id} last={data}")
         st_final = str(data.get("status") or "").upper()
+        executed = safe_float(data.get("executedQty")) or float(sz or 0)
         if st_final and st_final != "FILLED":
-            raise RuntimeError(
-                f"币安期权未完全成交 status={st_final} orderId={ord_id} last={data}"
-            )
+            if not (
+                allow_partial
+                and executed > 1e-12
+                and st_final in ("CANCELED", "EXPIRED", "PARTIALLY_FILLED")
+            ):
+                raise RuntimeError(
+                    f"币安期权未完全成交 status={st_final} orderId={ord_id} last={data}"
+                )
+            sz = executed
         from .money import abs_fee_usdt
 
         fee = abs(safe_float(data.get("fee")) or 0.0)