fix(swap): 修复部分平仓计息计算中的尾差处理问题

- 修正了部分平仓后待实现利息收入的预期值从 0.006383561644 到 -0.010438356164
- 修正了预期待实现利息值从 0.820569301369 到 0.410474008219
- 在 SwapDealService 中添加了已完成平仓事件的查询逻辑，排除已平仓头寸的本金计算
- 重构了 SwapEodPositionService 中的待结算利息计算逻辑，区分自动互换和平仓场景
- 在测试类中添加了已完成流程事件的查找方法和相关测试数据
- 更新了测试用例以验证平仓事件对利息计算的影响

UnitTestProject/Modules/SwapModule/SwapPositionComposeScenarioTest.cs

@@ -56,6 +56,7 @@ namespace YLErp.Modules.SwapModule
             protected override List<trade_extend> FindTradeExtends(List<int> tradeIds) => _extends;
             protected override List<eod_swap> FindEodSwapsByDate(DateTime valueDate) => _eodSwaps;
             protected override List<swap_flow_event> FindFlowEvents(int swapTradeId, DateTime settleDate) => _flowEvents;
+            protected override List<swap_flow_event> FindCompletedFlowEvents(List<int> tradeIds) => _flowEvents;
             protected override List<eod_swap_position> FindEodSwapPositions(int swapTradeId, DateTime preSettleDate)
                 => _eodPositions.Where(x => x.SwapTradeId == swapTradeId && x.ValueDate >= preSettleDate).ToList();
             protected override List<swap_position> FindSwapPositions(int swapTradeId)
@@ -296,7 +297,18 @@ namespace YLErp.Modules.SwapModule
                 new List<swap_position> { CreateFloatPosition(1, 1000), initialPrepay, realPrepay },
                 new List<eod_swap_position> { CreateFloatEodPosition(1, 1000, 1.0020m), prepayEod },
                 new List<eod_swap> { new eod_swap { SwapTradeId = SwapTradeId, ValueDate = PreSettleDate } },
-                new List<trade_extend> { CreateExtend() }, new List<swap_flow_event>());
+                new List<trade_extend> { CreateExtend() },
+                new List<swap_flow_event>
+                {
+                    CreateCloseFlowEvent(1, 300),
+                    new swap_flow_event
+                    {
+                        SwapTradeId = SwapTradeId, PositionId = initialPrepayId,
+                        EventType = (int)SwapEventTypeEnum.平仓,
+                        EventDate = SettleDate,
+                        DataState = (int)SwapFlowDateStateEnum.完成
+                    }
+                });
 
             service.ExecuteSwapPositionCompose(SettleDate, PreSettleDate);
 
@@ -338,13 +350,21 @@ namespace YLErp.Modules.SwapModule
             };
             var closeFlow = CreateCloseFlowEvent(1, 300);
             closeFlow.InterestRate = 0.01m;
+            var prepayCloseFlow = new swap_flow_event
+            {
+                SwapTradeId = SwapTradeId, PositionId = initialPrepayId,
+                EventType = (int)SwapEventTypeEnum.平仓,
+                EventDate = SettleDate, DataState = (int)SwapFlowDateStateEnum.完成,
+                InterestMode = (int)InterestModeEnum.初始预付金,
+                InterestPrincipal = 300m
+            };
             var service = new TestableSwapEodService(
                 new List<trade> { td },
                 new List<swap_position> { CreateFloatPosition(1, 1000), initialPrepay, realPrepay },
                 new List<eod_swap_position> { CreateFloatEodPosition(1, 1000, 1.0020m), prepayEod },
                 new List<eod_swap> { new eod_swap { SwapTradeId = SwapTradeId, ValueDate = PreSettleDate } },
                 new List<trade_extend> { CreateExtend() },
-                new List<swap_flow_event> { closeFlow });
+                new List<swap_flow_event> { closeFlow, prepayCloseFlow });
 
             service.ExecuteSwapPositionCompose(SettleDate, PreSettleDate);