fix(swap): 修正平仓事件日期过滤条件

- 将平仓事件的日期过滤从 EventDate 改为 UnwindDate
- 确保正确识别结算日期后的平仓流程
- 修复平仓事件日期比较逻辑的一致性问题

YLErpDAL/Modules/SwapModule/SwapDealService.cs

@@ -688,7 +688,7 @@ namespace YLErp.Modules.SwapModule
         {
             realPositions ??= new List<swap_position>();
             var futureFlows = (completedFlowEvents ?? Enumerable.Empty<swap_flow_event>())
-                .Where(x => x.EventType == (int)SwapEventTypeEnum.平仓 && x.EventDate > settleDate)
+                .Where(x => x.EventType == (int)SwapEventTypeEnum.平仓 && x.UnwindDate > settleDate)
                 .ToList();
             var originalNotional = origPositions.Where(x => x.PosiDirection > 0)
                 .Sum(x => x.PosiNotionalValue);
@@ -701,7 +701,7 @@ namespace YLErp.Modules.SwapModule
                 .GroupBy(x => x.PositionId)
                 .ToDictionary(x => x.Key, x => x.Sum(v => v.InterestPrincipal));
             var priorClosePositionIds = new HashSet<long>((completedFlowEvents ?? Enumerable.Empty<swap_flow_event>())
-                .Where(x => x.EventType == (int)SwapEventTypeEnum.平仓 && x.EventDate <= settleDate)
+                .Where(x => x.EventType == (int)SwapEventTypeEnum.平仓 && x.UnwindDate <= settleDate)
                 .Select(x => x.PositionId));
 
             return origPositions.Where(x => x.PosiDirection == 0).Select(p =>