fix(swap): 结算或全部平仓后，待实现置0

- 添加 NormalizeSettledInterestAmounts 方法处理手工平仓和互换的利息事件精度
- 添加 NormalizeManualSettlementAmounts 方法在手工结算前收敛流水金额
- 将利息计算精度从 ConsGlobal.PriceRound 统一调整为 InterestCalculationPrecision(12位)
- 在日终持仓快照中添加精度标准化处理，利息腿保留12位精度
- 修复全量平仓时待实现利息和费用的清零逻辑
- 在收益结算事件后清空待实现利息余额避免重复计算
- 更新单元测试验证现金与两位利息事件的一致性

UnitTestProject/Modules/SwapModule/SwapUnwindScenarioTest.cs

@@ -258,5 +258,36 @@ namespace YLErp.Modules.SwapModule
             Assert.AreEqual(500000.00m, savedData.CloseNotionalValue, "平仓名义本金应按两位小数写入事件");
             Assert.AreEqual(500000.01, td.StockEqvNotional, 0.000001, "trade 剩余名义本金应在扣减后舍入两位小数");
         }
+
+        [TestMethod]
+        public void UW_010_SwapUnwind_现金与两位利息事件保持一致()
+        {
+            var td = SwapDealTestFactory.CreateTrade();
+            var service = new TestableSwapDealService(td);
+            var unwindData = SwapDealTestFactory.CreateUnwindData(
+                swapRealizedPnL: 10.0049m, closeMethod: (int)CloseMethodEnum.全部平仓,
+                closePercent: 1m, closeQty: 10000m, closeNotionalValue: 1000000m, positionQty: 10000m);
+            var floatEvent = new swap_flow_event
+            {
+                UnderlyingCode = "UT-FLOAT", PositionType = (int)PositionTypeFlag.Long,
+                EventType = (int)SwapEventTypeEnum.平仓, PayDirection = 1, MarkClosePnl = 10m
+            };
+            var interestEvent = new swap_flow_event
+            {
+                PositionType = 0, InterestAmount = 0.0049m, TdInterestAmount = 0.0049m,
+                InterestClosePnL = 0.0049m, InterestFee = 0.0049m
+            };
+            unwindData.FlowEvents.Add(floatEvent);
+            unwindData.FlowEvents.Add(interestEvent);
+
+            service.SwapUnwind(unwindData);
+
+            Assert.AreEqual(0m, interestEvent.InterestAmount);
+            Assert.AreEqual(0m, interestEvent.TdInterestAmount);
+            Assert.AreEqual(0m, interestEvent.InterestClosePnL);
+            Assert.AreEqual(0m, interestEvent.InterestFee);
+            Assert.AreEqual(10m, unwindData.SwapRealizedPnL);
+            Assert.AreEqual(-10d, service.ClientCashCalls[0].amount, 0.001d);
+        }
     }
 }