refactor(accrual): EOD去退化差分——删除baseNotional死参数

EOD路径 orginPv≡posiPrincipal(调用点line1091/1096实证)，notional==baseNotional恒成立，
差分项 notional-baseNotional 恒为0，baseNotional 是死参数。

简化:
- AccrueSimpleEod: 删 notional+baseNotional 两参数，basis=priorNotional 直赋值
- AccrueCompoundEod: 删 baseNotional 参数，非重置日 basis=priorNotional
- SimpleEodBasis 整个删除(不再需要)
- CompoundEodBasis 去掉 baseNotional 参数
- EodContext trace 去掉 baseNotional
- 差分注释块删除(EOD不再有差分)

差分逻辑 notional-baseNotional 只该存在于 unwind 专用路径(Period函数本就没有baseNotional)
净减20行(18增/38删)，SwapModule零回归(7基线/508通过/8跳过)

Framework/YLErp.Core/Interest/AccrualTrace.cs

@@ -41,10 +41,10 @@ public sealed class AccrualTrace
         => Add(AccrualTraceEvent.DayAccrual, segStart,
             $"  [seg{idx}] [{segStart:yyyy-MM-dd},{segEnd:yyyy-MM-dd}) days={days} rate={rate:P6} basis={basis:F4} segInterest={segInterest:F6} acc={accumulated:F6}");
 
-    /// <summary>EOD 上下文：计息日、重置日标志、平仓比例、差分基数公式各分量。供日终单日计息定位"重置日分支选对了吗"。</summary>
-    public void EodContext(DateTime eodDate, bool isResetDay, decimal unwindFraction, decimal priorAccrued, decimal priorNotional, decimal notional, decimal baseNotional, decimal remainingFraction)
+    /// <summary>EOD 上下文：计息日、重置日标志、平仓比例、基数各分量。供日终单日计息定位"重置日分支选对了吗"。</summary>
+    public void EodContext(DateTime eodDate, bool isResetDay, decimal unwindFraction, decimal priorAccrued, decimal priorNotional, decimal notional, decimal remainingFraction)
         => Add(AccrualTraceEvent.Start, eodDate,
-            $"  CTX {eodDate:yyyy-MM-dd} reset={isResetDay} unwind={unwindFraction:P2} priorAccrued={priorAccrued:F4} priorNotional={priorNotional:F4} notional={notional:F4} baseNotional={baseNotional:F4} remainingFrac={remainingFraction:P4}");
+            $"  CTX {eodDate:yyyy-MM-dd} reset={isResetDay} unwind={unwindFraction:P2} priorAccrued={priorAccrued:F4} priorNotional={priorNotional:F4} notional={notional:F4} remainingFrac={remainingFraction:P4}");
 
     /// <summary>重置日<b>前</b>：生效利率(旧)与计息本金(滚动前)。利率/本金切换的"因"。</summary>
     public void ResetBefore(DateTime resetDate, decimal rateOld, decimal principalBefore)

UnitTestProject/Modules/SwapModule/Accrual/CompoundEodShadowTest.cs

@@ -100,7 +100,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
             var policy = new AccrualPolicy(AccrualBoundary.Both, true, 7, AnnualDays, true);
             var remainingPercent = Math.Max(0m, Math.Min(1m, Notional / Notional));
             var result = FundingLegAccrual.AccrueCompoundEod(
-                50_000m, Notional, Notional, 1m, Notional, rate, policy,
+                50_000m, Notional, Notional, 1m, rate, policy,
                 isResetDay: true, remainingPercent, EodDate);
 
             Console.WriteLine($"重置日: 旧 InterestAmount={oldInterest} Td={oldTd}");
@@ -132,7 +132,7 @@ namespace UnitTestProject.Modules.SwapModule.Accrual
             var rate = FundingLegRate.Fixed(FixedRate);
             var policy = new AccrualPolicy(AccrualBoundary.Both, true, 7, AnnualDays, true);
             var result = FundingLegAccrual.AccrueCompoundEod(
-                30_000m, Notional, Notional, 1m, Notional, rate, policy,
+                30_000m, Notional, Notional, 1m, rate, policy,
                 isResetDay: false, 0m, nonResetDate);
 
             Console.WriteLine($"非重置日: 旧 InterestAmount={oldInterest} Td={oldTd}");

YLErpDAL/Modules/SwapModule/Accrual/FundingLegAccrual.cs

@@ -11,51 +11,35 @@ namespace YLErp.Modules.SwapModule.Accrual;
 /// - accrued → 累计应计利息
 /// - unwindFraction → 平仓比例（0~1）
 /// - realizedInterest → 历史已结利息（legacy: consumedInterest）
-/// - baseNotional → 差分公式基数（legacy: orginPv/originalPv）
-/// - accrualBasis → 逐段滚动的计息基数（legacy: dynomicPrincipal=dynamicPrincipal typo）
+/// - priorNotional → 昨日终滚动计息基数（legacy: TdInterestPrincipal / dynomicPrincipal）
 /// </summary>
 public static class FundingLegAccrual
 {
     private const int Precision = SwapInterest.FundingLegPrecision;
 
-    // ───────────────────────────────────────────────────────────────────
-    // 计息基数（basis）——单一真相源，纯函数与调用方共用，消除公式重复。
-    //
-    // 差分语义：basis = priorNotional + (notional − baseNotional)
-    //   • priorNotional = 昨日终滚动计息基数（legacy: TdInterestPrincipal / dynomicPrincipal）
-    //   • notional − baseNotional = 名义本金绝对增量（加法式 carry，非比例缩放）
-    //   • EOD 路径：baseNotional == notional → 增量 0，basis 退化 = priorNotional
-    //   • unwind 路径：baseNotional = 上一日终浮动端名义本金(orginPv) ≠ notional → 增量生效
-    // ───────────────────────────────────────────────────────────────────
-
-    /// <summary>单利日终计息基数（差分公式）。调用方与 AccrueSimpleEod 共用。</summary>
-    public static decimal SimpleEodBasis(decimal priorNotional, decimal notional, decimal baseNotional)
-        => priorNotional + (notional - baseNotional);
-
-    /// <summary>复利日终计息基数：重置日 = notional + 累计利息×剩余比例(并本金)；
-    /// 非重置日 = 差分公式。remainingFraction 对齐 legacy 钳制到 [0,1]。调用方与 AccrueCompoundEod 共用。</summary>
+    /// <summary>复利日终计息基数（单一真相源，纯函数与调用方共用）：
+    /// 重置日 = notional + 累计利息×剩余比例(利息并入本金)；非重置日 = priorNotional（昨日滚动基数）。
+    /// remainingFraction 对齐 legacy 钳制到 [0,1]。</summary>
     public static decimal CompoundEodBasis(
-        bool isResetDay, decimal notional, decimal priorAccrued, decimal remainingFraction,
-        decimal priorNotional, decimal baseNotional)
+        bool isResetDay, decimal notional, decimal priorAccrued, decimal remainingFraction, decimal priorNotional)
         => isResetDay
             ? notional + priorAccrued * Math.Max(0m, Math.Min(1m, remainingFraction))
-            : priorNotional + (notional - baseNotional);
+            : priorNotional;
 
     /// <summary>
     /// 单利日终计息（替换 CalcDailySimpleInterestByEod 的纯数学部分）。
+    /// EOD 无差分：basis = priorNotional（昨日终滚动计息基数）。
     /// </summary>
     public static InterestResult AccrueSimpleEod(
         decimal priorAccrued,
         decimal priorNotional,
-        decimal notional,
         decimal unwindFraction,
-        decimal baseNotional,
         FundingLegRate rate,
         AccrualPolicy policy,
         DateTime eodDate,
         AccrualTrace? trace = null)
     {
-        var basis = SimpleEodBasis(priorNotional, notional, baseNotional);
+        var basis = priorNotional;
         var displayBasis = basis * unwindFraction;
 
         var allInRate = rate.AllInRate;
@@ -80,14 +64,13 @@ public static class FundingLegAccrual
     /// <summary>
     /// 复利日终计息（替换 CalcDailyCompoundInterestByEod 的纯数学部分）。
     /// 重置日：basis = notional + priorAccrued × remainingFraction（利息并入本金）。
-    /// 非重置日：basis = 差分公式（priorNotional + notional − baseNotional）。
+    /// 非重置日：basis = priorNotional（昨日终滚动计息基数）。
     /// </summary>
     public static InterestResult AccrueCompoundEod(
         decimal priorAccrued,
         decimal priorNotional,
         decimal notional,
         decimal unwindFraction,
-        decimal baseNotional,
         FundingLegRate rate,
         AccrualPolicy policy,
         bool isResetDay,
@@ -95,11 +78,11 @@ public static class FundingLegAccrual
         DateTime eodDate,
         AccrualTrace? trace = null)
     {
-        var basis = CompoundEodBasis(isResetDay, notional, priorAccrued, remainingFraction, priorNotional, baseNotional);
+        var basis = CompoundEodBasis(isResetDay, notional, priorAccrued, remainingFraction, priorNotional);
         var displayBasis = basis * unwindFraction;
 
         var allInRate = rate.AllInRate;
-        trace?.EodContext(eodDate, isResetDay, unwindFraction, priorAccrued, priorNotional, notional, baseNotional, remainingFraction);
+        trace?.EodContext(eodDate, isResetDay, unwindFraction, priorAccrued, priorNotional, notional, remainingFraction);
         var dayInterest = displayBasis * allInRate;
         var tdInterest = basis * allInRate;
         if (policy.IsAnnualized)

YLErpDAL/Modules/SwapModule/SwapDealService.cs

@@ -1541,7 +1541,6 @@ namespace YLErp.Modules.SwapModule
                 priorNotional: preEodPosition.TdInterestPrincipal,
                 notional: posiPrincipal,
                 unwindFraction: closePercent,
-                baseNotional: orginPv,
                 rate: legRate,
                 policy: accrualPolicy,
                 isResetDay: isResetDay,
@@ -1551,10 +1550,10 @@ namespace YLErp.Modules.SwapModule
             SwapCalcTrace.Write(interestTrace);
 
             // flowEvent.InterestPrincipal：当日计息基数(已按平仓比例缩放)——下游 EOD 用它播种次日 TdInterestPrincipal。
-            // 复用 CompoundEodBasis 单一真相源（与 AccrueCompoundEod 内部同一公式），不再重复三元表达式。
+            // 复用 CompoundEodBasis 单一真相源（与 AccrueCompoundEod 内部同一公式）。
             flowEvent.InterestPrincipal = FundingLegAccrual.CompoundEodBasis(
                 isResetDay, posiPrincipal, preEodPosition.InterestProfitSum, remainingFraction,
-                preEodPosition.TdInterestPrincipal, orginPv) * closePercent;
+                preEodPosition.TdInterestPrincipal) * closePercent;
 
             InterestAmount = result.Accrued;
             TdInterestAmount = result.AccruedToday;
@@ -1608,9 +1607,7 @@ namespace YLErp.Modules.SwapModule
             var result = FundingLegAccrual.AccrueSimpleEod(
                 priorAccrued: preEodPosition.InterestProfitSum,
                 priorNotional: preEodPosition.TdInterestPrincipal,
-                notional: posiPrincipal,
                 unwindFraction: closePercent,
-                baseNotional: orginPv,
                 rate: legRate,
                 policy: accrualPolicy,
                 eodDate: endDate,