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/SwapPositionComposeScenarioTest.cs

@@ -79,14 +79,14 @@ namespace YLErp.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)
             {
                 LastInterestCalculationPositions = positions;
                 return base.CalcSwapInterests(td, tradeExtend, valueDate, unwindDate,
-                    eodPositions, positions, posiNotionalValue, posiLongNotionalValue, posiShortNotionalValue,
+                    eodPositions, positions, posiNotionalValue,
                     closePosiNotionalValue, closePrecent, eventType, tdClose,
                     orginPv, add, settment, newCalcLast, closeList);
             }