优化做市引擎、偏移做市引擎和趋势引擎的订单管理逻辑，将待取消订单的类型从数字更改为字符串，确保在处理订单时的类型一致性。同时，增强风险检查逻辑，确保在平仓时使用正确的价格，提升交易策略的稳定性和准确性。

src/utils/math.ts

@@ -14,7 +14,8 @@ export function roundQtyDownToStep(value: number, step: number): number {
 export function decimalsOf(step: number): number {
   const s = step.toString();
   if (!s.includes(".")) return 0;
-  return s.split(".")[1].length;
+  const fraction = s.split(".")[1];
+  return fraction ? fraction.length : 0;
 }
 
 export function isNearlyZero(value: number, epsilon = 1e-5): boolean {

src/utils/risk.ts

@@ -9,18 +9,18 @@ export function shouldStopLoss(
   const absPosition = Math.abs(position.positionAmt);
   if (absPosition < 1e-5) return false;
 
+  if (!Number.isFinite(position.entryPrice) || Math.abs(position.entryPrice) < 1e-8) {
+    return false;
+  }
+
+  const closePrice = position.positionAmt > 0 ? bestBid : bestAsk;
+  if (!Number.isFinite(closePrice)) return false;
+
   const pnl = position.positionAmt > 0
-    ? (bestBid - position.entryPrice) * absPosition
-    : (position.entryPrice - bestAsk) * absPosition;
+    ? (closePrice - position.entryPrice) * absPosition
+    : (position.entryPrice - closePrice) * absPosition;
 
-  const unrealized = Number.isFinite(position.unrealizedProfit)
-    ? (position.unrealizedProfit as number)
-    : null;
+  if (!Number.isFinite(pnl)) return false;
 
-  const derivedLoss = pnl < -lossLimit;
-  const snapshotLoss = Boolean(unrealized != null && unrealized < -lossLimit && pnl <= 0);
-
-  return derivedLoss || snapshotLoss;
+  return pnl < -lossLimit;
 }
-
-