fix(swap): 修复互换价格变动时盈亏计算错误

- 在后端计算逻辑中添加 longRatio 参数用于区分多空头寸类型
- 修改前端 JavaScript 代码中的盈亏计算公式，加入 longRatio 参与计算
- 更新单元测试，增加空头头寸价格上涨时亏损的测试用例
- 补充前端测试用例验证空头头寸计算逻辑的准确性
- 修复了空头头寸在价格上涨时显示盈利而非亏损的计算错误

YLErpWeb/wwwroot/Scripts/app/swaptrade/incomeSwapTrade.js

@@ -197,6 +197,7 @@ const vue = new Vue({
         calcFloatClosePnl() {//计算浮动端平仓盈亏
             var thisObj = this;
             let floatRatio = thisObj.floatPosition.PayDirection == 1 ? 1 : -1;
+            let longRatio = thisObj.floatPosition.PositionType == 1 ? 1 : -1;
             let TradingFee = thisObj.floatPosition.TradingFee == "" ? 0 : parseFloat(thisObj.floatPosition.TradingFee);
             let TradingFeePending = thisObj.floatPosition.TradingFeePending == "" ? 0 : parseFloat(thisObj.floatPosition.TradingFeePending);
             let DividendIn = thisObj.floatPosition.DividendIn == "" ? 0 : parseFloat(thisObj.floatPosition.DividendIn ?? 0);
@@ -204,7 +205,7 @@ const vue = new Vue({
             // 债券全价是单位价格，价差盈亏应按持仓数量×合约乘数计算；
             // CloseNotionalValue 是期初全价折算后的名义本金，直接乘价差会重复包含期初价格。
             let positionAmount = parseFloat(thisObj.floatPosition.Quantity) * parseFloat(thisObj.floatPosition.ContractSize || 1);
-            thisObj.floatPosition.MarkClosePnl = positionAmount * (deliveryPrice - thisObj.initPosiGrossPrice) * floatRatio;
+            thisObj.floatPosition.MarkClosePnl = positionAmount * (deliveryPrice - thisObj.initPosiGrossPrice) * floatRatio * longRatio;
             thisObj.floatPosition.MarkClosePnl = formatSwapAmount(thisObj.floatPosition.MarkClosePnl);//MarkClosePnl 纯盯市不要计算交易费用和分红
             // 守卫: 浮动盈亏合计必须保留 2 位小数 → 对应历史 bug 3c5f25a5(原代码缺精度保留)
             // 数值由 swapCalc.calcFloatPnlSum 计算, 此处 .toFixed(2) 仅保留字符串类型以兼容下游

YLErpWeb/wwwroot/Scripts/app/swaptrade/swapCalc.js

@@ -179,6 +179,7 @@
         var entryPrice = input.posiGrossPrice;
         var scale = input.multiplier === 100 ? 0.01 : 1;
         var floatRatio = input.payDirection === 1 ? 1 : -1;
+        var longRatio = input.positionType === 1 ? 1 : -1;
 
         var tradingFee = parseOrZero(input.tradingFee);
         var tradingFeePending = parseOrZero(input.tradingFeePending);
@@ -187,7 +188,7 @@
         var contractSize = input.contractSize === undefined || input.contractSize === null
             ? 1 : Number(input.contractSize);
         var markClosePnl = roundHalfAwayFromZero(
-            input.positionQty * contractSize * (input.tradingAmountAvg * scale - entryPrice) * floatRatio, 2);
+            input.positionQty * contractSize * (input.tradingAmountAvg * scale - entryPrice) * floatRatio * longRatio, 2);
 
         var floatPnlSum = roundHalfAwayFromZero(markClosePnl + tradingFee + tradingFeePending + dividendIn, 2);