refactor(swap): relaxedFixingFromDate 改名 exclusionStart——名实归位

该参数诞生于"有价则取/缺价回退"口径(55363e9f 由 exclusionEndDate 改名而来)，
自洽化(fafae5ca)后排除日一概不取价，"放宽取价"语义已不存在——名字回到
排除区间本义，并与 FIX 日志既有用词"排除起点"对齐：
- BuildSegmentRates/CalcDailyCompoundInterest/CalcDailySimpleInterest 三签名
  + 全平重放传参点 + 方法摘要补 exclusionStart 参数语义文档
零行为变更。

验证：内存套件 113/113；全量 981 例 145 败与基线 diff=0

UnitTestProject/Modules/SwapModule/GLMS20260817Fr007UnwindMorningTest.cs

@@ -577,9 +577,9 @@ namespace YLErp.Modules.SwapModule
             StringAssert.Contains(o.Ex.Message, "FR007");
         }
 
-        // ── 到期日当天全平：replayEndDate=endDate+1 补计分支（relaxedFixingFromDate 的存在理由）──
+        // ── 到期日当天全平：replayEndDate=endDate+1 补计分支（exclusionStart 的存在理由）──
         // 不算尾时 InitInterestDate 把 endDate 回拨一天；最终全平的历史差分重放需把窗口补回真实
-        // 平仓/到期日（replayEndDate=endDate+1），但该边界日的定盘经 relaxedFixingFromDate 标记为
+        // 平仓/到期日（replayEndDate=endDate+1），但该边界日的定盘经 exclusionStart 标记为
         // "有价则取/缺价跳过"——否则到期日上午全平会被尾日价误拦（EQD-6968 在到期日的镜像场景）。
 
         [TestMethod]

YLErpDAL/Modules/SwapModule/SwapDealService.cs

@@ -1294,7 +1294,7 @@ namespace YLErp.Modules.SwapModule
                         // 计算截至本次平仓日的累计利息 amountAtEnd
                         CalcDailyCompoundInterest(replayEndDate, position, closePosiNotionalValue,
                             interestAtEnd, annualDays, floateRate, closePrecent,
-                            calcFirst, calcLast, ref amountAtEnd, ref tdAmountAtEnd, consumedInterest, relaxedFixingFromDate: endDate);
+                            calcFirst, calcLast, ref amountAtEnd, ref tdAmountAtEnd, consumedInterest, exclusionStart: endDate);
                         var interestAtPreviousEod = new swap_flow_event { InterestRate = rate };
                         decimal amountAtPreviousEod = 0m;
                         decimal tdAmountAtPreviousEod = 0m;
@@ -1356,11 +1356,13 @@ namespace YLErp.Modules.SwapModule
         /// <summary>
         /// 按重置周期切分利率段，每段记录 all-in 利率(spread+fixing)。返回 (分段列表, 末段浮动利率)。
         /// fetchAfterDate: 仅该日期之后的重置日才取 FR007（单利传 ValueDate，复利传 null 全程取）。
+        /// exclusionStart: 排除区间起点——该日期起(含)的重置日视为"排除日"(不算尾的不计息边界日)，
+        /// 一概不取价；缺省=endDate。仅不算尾(calcLast=false)生效；算尾所有重置日照常强制取价。
         /// </summary>
         private (List<(DateTime StartDate, decimal Rate)> Segments, decimal LastFloat) BuildSegmentRates(
             DateTime startDate, DateTime endDate, int interestPeriod,
             swap_position position, decimal spread, decimal initialFloat,
-            DateTime? fetchAfterDate, bool calcLast = true, DateTime? relaxedFixingFromDate = null)
+            DateTime? fetchAfterDate, bool calcLast = true, DateTime? exclusionStart = null)
         {
             var rates = new List<(DateTime, decimal)>();
             var calcDays = (endDate - startDate).Days;
@@ -1368,7 +1370,7 @@ namespace YLErp.Modules.SwapModule
             SwapCalcTrace.Critical(
                 $"FIX Segments p{position.id} [{startDate:yyyy-MM-dd}→{endDate:yyyy-MM-dd}] period={interestPeriod} " +
                 $"fetchAfter={(fetchAfterDate?.ToString("yyyy-MM-dd") ?? "全程")} calcLast={calcLast} " +
-                $"排除起点={(relaxedFixingFromDate?.ToString("yyyy-MM-dd") ?? (calcLast ? "无" : endDate.ToString("yyyy-MM-dd")))} seed={initialFloat:P6} spread={spread:P6}");
+                $"排除起点={(exclusionStart?.ToString("yyyy-MM-dd") ?? (calcLast ? "无" : endDate.ToString("yyyy-MM-dd")))} seed={initialFloat:P6} spread={spread:P6}");
             for (int i = 0; i <= calcDays; i += interestPeriod)
             {
                 var resetDate = startDate.AddDays(i);
@@ -1377,7 +1379,7 @@ namespace YLErp.Modules.SwapModule
                 // 排除日(EQD-6968 自洽化)一概不取价(有价也不取)，currentFloat 保持末段已消费利率：
                 // 事件/快照回写的浮动利率与金额同源、与平仓时刻无关。剩余持仓的新周期利率由
                 // SwapEodPositionService 的"重置日再定盘"显式获取，不靠排除日顺带。算尾照常强制取价。
-                bool isExcludedEnd = !calcLast && resetDate >= (relaxedFixingFromDate ?? endDate);
+                bool isExcludedEnd = !calcLast && resetDate >= (exclusionStart ?? endDate);
                 if (needFetch && !isExcludedEnd)
                 {
                     currentFloat = ResolveFloatRate(position, resetDate, currentFloat);
@@ -1405,17 +1407,17 @@ namespace YLErp.Modules.SwapModule
         /// <returns></returns>
         public void CalcDailyCompoundInterest(DateTime endDate, swap_position position, decimal principal, swap_flow_event flowEvent,
             int annualDays, decimal floateRate, decimal closePercent, bool calcFirst, bool calcLast,
-            ref decimal InterestAmount, ref decimal TdInterestAmount, decimal consumedInterest = 0m, decimal resetCarryInterest = 0m, DateTime? relaxedFixingFromDate = null)
+            ref decimal InterestAmount, ref decimal TdInterestAmount, decimal consumedInterest = 0m, decimal resetCarryInterest = 0m, DateTime? exclusionStart = null)
         {
             var startDate = position.PosiStartDate;
             int interestPeriod = position.interest_rest_days ?? 1;
 
             // 分段取率：复利全程重放，每个重置日(含 startDate)取 FR007（fetchAfterDate=null）。
             // calcLast 透传，与下方 AccruePeriod 的边界同源，避免两处漂移；
-            // relaxedFixingFromDate 仅重放补计不算尾漏计利息时非 null(=真实平仓日)，锚定尾日跳过取价起点。
+            // exclusionStart 仅重放补计不算尾漏计利息时非 null(=真实平仓日)，锚定尾日跳过取价起点。
             var (segmentRates, currentFloat) = BuildSegmentRates(
                 startDate, endDate, interestPeriod, position, flowEvent.InterestRate, floateRate,
-                fetchAfterDate: null, calcLast: calcLast, relaxedFixingFromDate: relaxedFixingFromDate);
+                fetchAfterDate: null, calcLast: calcLast, exclusionStart: exclusionStart);
 
             // 纯函数复利计息：分段重置日并本金 + resetCarryInterest + 扣 consumedInterest
             var interestTrace = new AccrualTrace();
@@ -1445,7 +1447,7 @@ namespace YLErp.Modules.SwapModule
         /// <summary>
         /// 计算单利 盘中（按重置天数分段，每段使用对应浮动利率）
         /// </summary>
-        public void CalcDailySimpleInterest(eod_swap_position preEodPosition, DateTime endDate, swap_position position, decimal posiPrincipal, swap_flow_event flowEvent, int annualDays, decimal floateRate, decimal closePercent, decimal orginPv, bool calcFirst, bool calcLast, ref decimal InterestAmount, ref decimal TdInterestAmount, decimal consumedInterest = 0m, DateTime? relaxedFixingFromDate = null)
+        public void CalcDailySimpleInterest(eod_swap_position preEodPosition, DateTime endDate, swap_position position, decimal posiPrincipal, swap_flow_event flowEvent, int annualDays, decimal floateRate, decimal closePercent, decimal orginPv, bool calcFirst, bool calcLast, ref decimal InterestAmount, ref decimal TdInterestAmount, decimal consumedInterest = 0m, DateTime? exclusionStart = null)
         {
             var startDate = position.PosiStartDate;
             int interestPeriod = position.interest_rest_days ?? 1;
@@ -1458,7 +1460,7 @@ namespace YLErp.Modules.SwapModule
             // calcLast 透传，与下方 AccruePeriod 的边界同源，避免两处漂移。
             var (segmentRates, currentFloat) = BuildSegmentRates(
                 startDate, endDate, interestPeriod, position, flowEvent.InterestRate, floateRate,
-                fetchAfterDate: preEodPosition.ValueDate, calcLast: calcLast, relaxedFixingFromDate: relaxedFixingFromDate);
+                fetchAfterDate: preEodPosition.ValueDate, calcLast: calcLast, exclusionStart: exclusionStart);
 
             // 纯函数计息：Accrued=缩放累计(InterestAmount)，AccruedToday=未缩放累计(TdInterestAmount)
             var interestTrace = new AccrualTrace();