refactor(swap): 合并多空名义本金参数为单一 posiTotalNotional 并加固测试

- DealInterests 的 posiLongNotionalValue + posiShortNotionalValue 合并为 posiTotalNotional（调用点以 posiLongNotional+posiShortNotional 求和传入），净减一个参数

- SwapDealService / SwapEodPositionService / InterestCalcRequest 同步收敛多空死管道参数

- 19 个测试调用点适配新签名

- SwapEodPositionServiceIntegrationTest 参数计数断言由裸数字改为参数名集合断言（CollectionAssert.AreEquivalent，对增删/重排/改名敏感）

UnitTestProject/Modules/SwapModule/SwapInterestScenario3And4FloatingTest.cs

@@ -178,7 +178,7 @@ namespace UnitTestProject.Modules.SwapModule
             protected override List<swap_flow_event> CalcSwapInterests(
                 trade td, trade_extend tradeExtend, DateTime valueDate, DateTime unwindDate,
                 List<eod_swap_position> eodPositions, List<swap_position> positions,
-                decimal posiNotionalValue, decimal posiLongNotionalValue, decimal posiShortNotionalValue,
+                decimal posiNotionalValue,
                 decimal closePosiNotionalValue, decimal closePrecent, int eventType, bool tdClose,
                 decimal orginPv, bool add = false, bool settment = true, bool newCalcLast = false,
                 List<swap_flow_event> closeList = null)
@@ -186,7 +186,7 @@ namespace UnitTestProject.Modules.SwapModule
                 var svc = new RealSwapDealService(
                     new OptUserInfo(0, nameof(SwapInterestScenario3And4FloatingTest), OptUserFrom.UnitTest), _floatRates, FlowEvents);
                 var interests = svc.GetInterests(td, tradeExtend, valueDate, unwindDate,
-                    eodPositions, positions, posiNotionalValue, posiLongNotionalValue, posiShortNotionalValue,
+                    eodPositions, positions, posiNotionalValue,
                     closePosiNotionalValue, closePrecent, eventType, tdClose,
                     orginPv, add, settment, newCalcLast, closeList);
                 // 捕获 base InterestPrincipal（= EOD:1406 行赋给 TdInterestPrincipal 的值，反推前），供 TdInterestPrincipal 断言镜像分叉。
@@ -226,7 +226,7 @@ namespace UnitTestProject.Modules.SwapModule
                 List<swap_flow_event> flowEvents, decimal closeNotional, eod_swap_position prevEod)
             {
                 SaveAutoEodWithCloseInterestPosition(prevEod, null, position, _td, valueDate, null,
-                    posiLongNotional, posiShortNotional, flowEvents, closeNotional, false, 1m,
+                    posiLongNotional + posiShortNotional, flowEvents, closeNotional, false, 1m,
                     posiLongNotional + posiShortNotional);
                 return PersistedPositions.LastOrDefault();
             }
@@ -394,7 +394,7 @@ namespace UnitTestProject.Modules.SwapModule
             var interests = svc.GetInterests(
                 td, td.trade_extend, valueDate, valueDate,
                 prevEod, new List<swap_position> { position },
-                closeNotional, closeNotional, 0m, closeNotional, 1m,
+                closeNotional, closeNotional, 1m,
                 (int)SwapEventTypeEnum.平仓,
                 false, closeNotional, false, settment: false, newCalcLast: isMaturity);
             Assert.AreEqual(1, interests.Count);