refactor(accrual): 拆分FundingLegAccrual→SimpleInterestAccrual/CompoundInterestAccrual

单利与复利语义完全不同(单利本金恒定/复利重置日并本金),
拆成两个独立静态类,各自只含自己的方法:

SimpleInterestAccrual:
- AccrueEod (原AccrueSimpleEod)
- AccruePeriod (原AccrueSimplePeriod)

CompoundInterestAccrual:
- EodBasis (原CompoundEodBasis)
- AccrueEod (原AccrueCompoundEod)
- AccruePeriod (原AccrueCompoundPeriod)

方法名去掉Simple/Compound前缀(类名已携带类型),消除冗余
SwapModule零回归(7基线/510通过)

UnitTestProject/Modules/SwapModule/Accrual/CompoundEodShadowTest.cs

@@ -13,7 +13,7 @@ using YLErp.Core.Interest;
 namespace UnitTestProject.Modules.SwapModule.Accrual
 {
     /// <summary>
-    /// 影子测试：CalcDailyCompoundInterestByEod（旧逐日循环）vs FundingLegAccrual.AccrueCompoundEod（新纯函数）。
+    /// 影子测试：CalcDailyCompoundInterestByEod（旧逐日循环）vs CompoundInterestAccrual.AccrueEod（新纯函数）。
     /// 构造同一组参数，两套实现并行跑，断言结果一致（到分）。
     /// </summary>
     [TestClass]
@@ -99,7 +99,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
             var rate = FundingLegRate.Fixed(FixedRate);
             var policy = new AccrualPolicy(AccrualBoundary.Both, true, 7, AnnualDays, true);
             var remainingPercent = Math.Max(0m, Math.Min(1m, Notional / Notional));
-            var result = FundingLegAccrual.AccrueCompoundEod(
+            var result = CompoundInterestAccrual.AccrueEod(
                 50_000m, Notional, Notional, 1m, rate, policy,
                 isResetDay: true, remainingPercent, EodDate);
 
@@ -131,7 +131,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
             // 新方法
             var rate = FundingLegRate.Fixed(FixedRate);
             var policy = new AccrualPolicy(AccrualBoundary.Both, true, 7, AnnualDays, true);
-            var result = FundingLegAccrual.AccrueCompoundEod(
+            var result = CompoundInterestAccrual.AccrueEod(
                 30_000m, Notional, Notional, 1m, rate, policy,
                 isResetDay: false, 0m, nonResetDate);
 

UnitTestProject/Modules/SwapModule/Accrual/CompoundPeriodShadowTest.cs

@@ -7,7 +7,7 @@ using YLErp.Modules.SwapModule.Accrual;
 namespace UnitTestProject.Modules.SwapModule.Accrual
 {
     /// <summary>
-    /// 影子测试：CalcDailyCompoundInterest（旧逐日循环）vs FundingLegAccrual.AccrueCompoundPeriod（新分段纯函数）。
+    /// 影子测试：CalcDailyCompoundInterest（旧逐日循环）vs CompoundInterestAccrual.AccruePeriod（新分段纯函数）。
     /// </summary>
     [TestClass]
     public class CompoundPeriodShadowTest
@@ -86,7 +86,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
                 (StartDate.AddDays(7), allInRate),
                 (StartDate.AddDays(14), allInRate),
             };
-            var result = FundingLegAccrual.AccrueCompoundPeriod(
+            var result = CompoundInterestAccrual.AccruePeriod(
                 notional: Notional,
                 segmentRates: segRates,
                 startDate: StartDate,
@@ -133,7 +133,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
                 (StartDate.AddDays(7), allInRate),
                 (StartDate.AddDays(14), allInRate),
             };
-            var result = FundingLegAccrual.AccrueCompoundPeriod(
+            var result = CompoundInterestAccrual.AccruePeriod(
                 notional: Notional * closePct,
                 segmentRates: segRates,
                 startDate: StartDate,
@@ -177,7 +177,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
                 (StartDate.AddDays(7), allInRate),
                 (StartDate.AddDays(14), allInRate),
             };
-            var result = FundingLegAccrual.AccrueCompoundPeriod(
+            var result = CompoundInterestAccrual.AccruePeriod(
                 notional: Notional,
                 segmentRates: segRates,
                 startDate: StartDate,

UnitTestProject/Modules/SwapModule/Accrual/SimplePeriodShadowTest.cs

@@ -12,7 +12,7 @@ using YLErp.Derivatives.Interest;
 namespace UnitTestProject.Modules.SwapModule.Accrual
 {
     /// <summary>
-    /// 影子测试：CalcDailySimpleInterest（旧逐日循环）vs FundingLegAccrual.AccrueSimplePeriod（新分段纯函数）。
+    /// 影子测试：CalcDailySimpleInterest（旧逐日循环）vs SimpleInterestAccrual.AccruePeriod（新分段纯函数）。
     /// </summary>
     [TestClass]
     public class SimplePeriodShadowTest
@@ -106,7 +106,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
             // 旧代码差分: dynomicPrincipal = preEod.TdInterestPrincipal(=0) + posiPrincipal - orginPv = 0
             var segRates = new List<(DateTime, decimal)> { (StartDate, Spread) };
             var accrualPrincipal = 0m + Notional - Notional; // 差分 = 0
-            var result = FundingLegAccrual.AccrueSimplePeriod(
+            var result = SimpleInterestAccrual.AccruePeriod(
                 priorAccrued: 0m,
                 notional: 0m,
                 unwindFraction: 1m,
@@ -152,7 +152,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
             // 差分本金 = preEod.TdInterestPrincipal + posiPrincipal - orginPv
             var accrualPrincipal = Notional + Notional - Notional;
             var segRates = new List<(DateTime, decimal)> { (StartDate, Spread) };
-            var result = FundingLegAccrual.AccrueSimplePeriod(
+            var result = SimpleInterestAccrual.AccruePeriod(
                 priorAccrued: 200_000m * 0.5m,
                 notional: accrualPrincipal,
                 unwindFraction: 0.5m,
@@ -215,7 +215,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
 
             // 差分本金 = preEod.TdInterestPrincipal + posiPrincipal - orginPv
             var accrualPrincipal = Notional + Notional - Notional;
-            var result = FundingLegAccrual.AccrueSimplePeriod(
+            var result = SimpleInterestAccrual.AccruePeriod(
                 priorAccrued: 200_000m * closePct,
                 notional: accrualPrincipal,
                 unwindFraction: closePct,

UnitTestProject/Modules/SwapModule/SwapUnwindSameDayDoublePartialTest.cs

@@ -8,7 +8,7 @@ namespace YLErp.Modules.SwapModule
     /// 【同日多次部分平仓 · unwind 基数滚动表征测试】
     /// ============================================================================
     /// 背景：unwind 计息基数公式 basis = priorNotional + notional - baseNotional
-    ///   (FundingLegAccrual / CalcDailyCompoundInterestByEod 同源)，其中
+    ///   (CompoundInterestAccrual / CalcDailyCompoundInterestByEod 同源)，其中
     ///   - priorNotional = 上一日终归档 eod_swap_position.TdInterestPrincipal
     ///   - baseNotional  = orginPv = ResolveUnwindPreviousNotional(lastEod)（上一日终浮动端名义本金）
     ///   - notional      = 当前持仓名义本金（posiNotionalValue，来自实时持仓）