refactor(return-leg): 抽取 PositionValueCalc 持仓价值汇总

SwapEodPositionService 8处 SwapPositionValue inline 公式替换:
- 4处 InterestProfitSum * ratio + PosiProfitSum → PositionValueCalc.Calc(带ratio)
- 4处 InterestProfitSum + PosiProfitSum → PositionValueCalc.Calc(默认ratio=1)

持仓价值 = 利息端收益 + 浮动端收益, 8处副本→1个纯函数。
这是最后一个高性价比的纯函数提取。

验证: 编译0错误, 全量513测试7失败(基线一致)。

UnitTestProject/Modules/SwapModule/ReturnLegs/PositionValueCalcTest.cs

@@ -0,0 +1,25 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using YLErp.Modules.SwapModule.ReturnLegs;
+
+namespace UnitTestProject.Modules.SwapModule.ReturnLegs
+{
+    [TestClass]
+    public class PositionValueCalcTest
+    {
+        [TestMethod]
+        public void 无方向因子_利息加浮动()
+            => Assert.AreEqual(1500m, PositionValueCalc.Calc(1000m, 500m));
+
+        [TestMethod]
+        public void 收取方向_利息乘1()
+            => Assert.AreEqual(1500m, PositionValueCalc.Calc(1000m, 500m, 1m));
+
+        [TestMethod]
+        public void 支付方向_利息乘负1()
+            => Assert.AreEqual(-500m, PositionValueCalc.Calc(1000m, 500m, -1m));
+
+        [TestMethod]
+        public void 零利息_等于浮动端()
+            => Assert.AreEqual(500m, PositionValueCalc.Calc(0m, 500m));
+    }
+}

YLErpDAL/Modules/SwapModule/ReturnLegs/PositionValueCalc.cs

@@ -0,0 +1,15 @@
+namespace YLErp.Modules.SwapModule.ReturnLegs;
+
+/// <summary>
+/// 持仓价值（SwapPositionValue）汇总。
+///
+/// SwapPositionValue = 利息端收益 + 浮动端收益。
+/// 利息端可能带方向因子(收取/支付)，浮动端不含方向因子。
+/// 原代码在 SwapEodPositionService 8处重复此公式(1115/1258/1519/1647/1746/1830/1938/2113)。
+/// </summary>
+public static class PositionValueCalc
+{
+    /// <summary>持仓价值 = 利息端 × 方向因子 + 浮动端。</summary>
+    public static decimal Calc(decimal interestProfitSum, decimal posiProfitSum, decimal ratio = 1m)
+        => interestProfitSum * ratio + posiProfitSum;
+}

YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs

@@ -1112,7 +1112,7 @@ namespace YLErp.Modules.SwapModule
             }
             newEodPayPosition.InterestProfitSum = newEodPayPosition.InterestIncomeSum + newEodPayPosition.InterestFeeSum;
             //持仓价值
-            newEodPayPosition.SwapPositionValue = newEodPayPosition.InterestProfitSum * ratio + newEodPayPosition.PosiProfitSum;
+            newEodPayPosition.SwapPositionValue = PositionValueCalc.Calc(newEodPayPosition.InterestProfitSum, newEodPayPosition.PosiProfitSum, ratio);
 
             //累计已实现
             newEodPayPosition.RealizedInterest = eodPayPosition.RealizedInterest + newEodPayPosition.TdCloseInterest * ratio;
@@ -1255,7 +1255,7 @@ namespace YLErp.Modules.SwapModule
                 : RoundEodInterest(eodPayPosition.InterestFeeSum + newEodPayPosition.TdInterestFee - newEodPayPosition.TdCloseInterestFee);
             newEodPayPosition.InterestProfitSum = newEodPayPosition.InterestIncomeSum + newEodPayPosition.InterestFeeSum;
             //持仓价值
-            newEodPayPosition.SwapPositionValue = newEodPayPosition.InterestProfitSum * ratio + newEodPayPosition.PosiProfitSum;
+            newEodPayPosition.SwapPositionValue = PositionValueCalc.Calc(newEodPayPosition.InterestProfitSum, newEodPayPosition.PosiProfitSum, ratio);
 
             //累计已实现
             newEodPayPosition.RealizedInterest = eodPayPosition.RealizedInterest + newEodPayPosition.TdCloseInterest * ratio;
@@ -1516,7 +1516,7 @@ namespace YLErp.Modules.SwapModule
             // InterestProfitSum 是利息腿待实现总额，包含利息和费用；无费用时等于 InterestIncomeSum。
             newEodPayPosition.InterestProfitSum = newEodPayPosition.InterestIncomeSum + newEodPayPosition.InterestFeeSum;
             //持仓价值
-            newEodPayPosition.SwapPositionValue = newEodPayPosition.InterestProfitSum * ratio + newEodPayPosition.PosiProfitSum;
+            newEodPayPosition.SwapPositionValue = PositionValueCalc.Calc(newEodPayPosition.InterestProfitSum, newEodPayPosition.PosiProfitSum, ratio);
 
             Log.Info($"InterestIncomeSum is {eodPayPosition.InterestIncomeSum},TdInterestIncome is {newEodPayPosition.TdInterestIncome}" +
                      $",TdCloseInterest is {newEodPayPosition.TdCloseInterest}");
@@ -1644,7 +1644,7 @@ namespace YLErp.Modules.SwapModule
             newEodPayPosition.InterestFeeSum = eodPayPosition.InterestFeeSum + newEodPayPosition.TdInterestFee - newEodPayPosition.TdCloseInterestFee;
             newEodPayPosition.InterestProfitSum = newEodPayPosition.InterestIncomeSum + newEodPayPosition.InterestFeeSum;
             //持仓价值
-            newEodPayPosition.SwapPositionValue = newEodPayPosition.InterestProfitSum * ratio + newEodPayPosition.PosiProfitSum;
+            newEodPayPosition.SwapPositionValue = PositionValueCalc.Calc(newEodPayPosition.InterestProfitSum, newEodPayPosition.PosiProfitSum, ratio);
 
             //累计已实现
             newEodPayPosition.RealizedInterest = eodPayPosition.RealizedInterest + newEodPayPosition.TdCloseInterest * ratio;
@@ -1743,7 +1743,7 @@ namespace YLErp.Modules.SwapModule
             newEodPayPosition.PosiProfitSum = newEodPayPosition.PosiMtmPnL + newEodPayPosition.PosiDividendSum + newEodPayPosition.PosiFeePending;
 
             //持仓价值
-            newEodPayPosition.SwapPositionValue = newEodPayPosition.InterestProfitSum + newEodPayPosition.PosiProfitSum;
+            newEodPayPosition.SwapPositionValue = PositionValueCalc.Calc(newEodPayPosition.InterestProfitSum, newEodPayPosition.PosiProfitSum);
             //累计已实现
             newEodPayPosition.RealizedFee = closeFee;
             newEodPayPosition.RealizedMtmPnL = newEodPayPosition.TdCloseMtmPnl;
@@ -1827,7 +1827,7 @@ namespace YLErp.Modules.SwapModule
           , seekPreday: true, currencyRateType: curretEod.PosiDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
             curretEod.TdCurrency = Convert.ToDecimal(currencyRate);
             //持仓价值
-            curretEod.SwapPositionValue = curretEod.InterestProfitSum + curretEod.PosiProfitSum;
+            curretEod.SwapPositionValue = PositionValueCalc.Calc(curretEod.InterestProfitSum, curretEod.PosiProfitSum);
             UpdateDbOption(curretEod);
             curretEod.Invalid = false;
             if (curretEod.id == 0)
@@ -1935,7 +1935,7 @@ namespace YLErp.Modules.SwapModule
           , seekPreday: true, currencyRateType: curretEod.PosiDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
             curretEod.TdCurrency = Convert.ToDecimal(currencyRate);
             //持仓价值
-            curretEod.SwapPositionValue = curretEod.InterestProfitSum + curretEod.PosiProfitSum;
+            curretEod.SwapPositionValue = PositionValueCalc.Calc(curretEod.InterestProfitSum, curretEod.PosiProfitSum);
             UpdateDbOption(curretEod);
             curretEod.Invalid = false;
             if (curretEod.id == 0)
@@ -2110,7 +2110,7 @@ namespace YLErp.Modules.SwapModule
                 curretEod.PosiNotionalValue = 0;
             }
             //持仓价值
-            curretEod.SwapPositionValue = curretEod.InterestProfitSum + curretEod.PosiProfitSum;
+            curretEod.SwapPositionValue = PositionValueCalc.Calc(curretEod.InterestProfitSum, curretEod.PosiProfitSum);
             var currencyRate = new EodCurrencyRateService(UserInfo).GetCurrencyRate(td.QuoteCurrency, td.SettlementCurrency, td.StartDate.Value
           , seekPreday: true, currencyRateType: curretEod.PosiDirection == (int)SwapDirectionEnum.收取 ? CurrencyRateType.Buy : CurrencyRateType.Sell);
             curretEod.TdCurrency = Convert.ToDecimal(currencyRate);