refactor(return-leg): QuantityRollforward 改名 QtyRollforward

代码里统一用 Qty 表示数量, 命名更简洁。
文件/类/测试类同步改名: Quantity→Qty。

UnitTestProject/Modules/SwapModule/ReturnLegs/QtyRollforwardTest.cs

@@ -6,58 +6,55 @@ namespace UnitTestProject.Modules.SwapModule.ReturnLegs
     /// 标的端数量递推测试。验证开仓/平仓/公司行为场景下数量正确推进。
     /// </summary>
     [TestClass]
-    public class QuantityRollforwardTest
+    public class QtyRollforwardTest
     {
         [TestMethod]
         public void 无交易_数量不变()
         {
-            Assert.AreEqual(1000m, QuantityRollforward.Calc(1000m, 0m, 0m));
+            Assert.AreEqual(1000m, QtyRollforward.Calc(1000m, 0m, 0m));
         }
 
         [TestMethod]
         public void 开仓_数量增加()
         {
-            Assert.AreEqual(1500m, QuantityRollforward.Calc(1000m, 500m, 0m));
+            Assert.AreEqual(1500m, QtyRollforward.Calc(1000m, 500m, 0m));
         }
 
         [TestMethod]
         public void 平仓_数量减少()
         {
-            Assert.AreEqual(600m, QuantityRollforward.Calc(1000m, 0m, 400m));
+            Assert.AreEqual(600m, QtyRollforward.Calc(1000m, 0m, 400m));
         }
 
         [TestMethod]
         public void 开仓加平仓_净值()
         {
-            Assert.AreEqual(1200m, QuantityRollforward.Calc(1000m, 500m, 300m));
+            Assert.AreEqual(1200m, QtyRollforward.Calc(1000m, 500m, 300m));
         }
 
         [TestMethod]
         public void 全平_数量归零()
         {
-            Assert.AreEqual(0m, QuantityRollforward.Calc(1000m, 0m, 1000m));
+            Assert.AreEqual(0m, QtyRollforward.Calc(1000m, 0m, 1000m));
         }
 
         [TestMethod]
         public void 超额平仓_不低于零()
         {
-            Assert.AreEqual(0m, QuantityRollforward.Calc(1000m, 0m, 1500m));
+            Assert.AreEqual(0m, QtyRollforward.Calc(1000m, 0m, 1500m));
         }
 
         [TestMethod]
         public void 公司行为送股_数量增加_默认不影响()
         {
-            // 默认 corpActionDeltaQty=0, 行为不变
-            Assert.AreEqual(1000m, QuantityRollforward.Calc(1000m, 0m, 0m));
-            // 送股 10%: 1000 × 10% = 100
-            Assert.AreEqual(1100m, QuantityRollforward.Calc(1000m, 0m, 0m, corpActionDeltaQty: 100m));
+            Assert.AreEqual(1000m, QtyRollforward.Calc(1000m, 0m, 0m));
+            Assert.AreEqual(1100m, QtyRollforward.Calc(1000m, 0m, 0m, corpActionDeltaQty: 100m));
         }
 
         [TestMethod]
         public void 公司行为拆股_数量翻倍()
         {
-            // 1拆2: 数量翻倍, corpActionDeltaQty = 当前数量
-            Assert.AreEqual(2000m, QuantityRollforward.Calc(1000m, 0m, 0m, corpActionDeltaQty: 1000m));
+            Assert.AreEqual(2000m, QtyRollforward.Calc(1000m, 0m, 0m, corpActionDeltaQty: 1000m));
         }
     }
 }

YLErpDAL/Modules/SwapModule/ReturnLegs/QtyRollforward.cs

@@ -1,7 +1,7 @@
 namespace YLErp.Modules.SwapModule.ReturnLegs;
 
 /// <summary>
-/// 标的端数量递推（quantity rollforward）。
+/// 标的端数量递推（Qty Rollforward）。
 ///
 /// 逐日推进持仓数量：今日数量 = 上一日终数量 + 今日开仓 - 今日平仓 + 公司行为调整。
 ///
@@ -9,7 +9,7 @@ namespace YLErp.Modules.SwapModule.ReturnLegs;
 /// 预留给公司行为改造（送股/拆股/配股）——届时填入非零值。
 /// 原代码(SwapEodPositionService:1980)只有开仓/平仓两项，硬编码了"数量只因交易变动"假设。
 /// </summary>
-public static class QuantityRollforward
+public static class QtyRollforward
 {
     /// <summary>
     /// 计算今日持仓数量。

YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs

@@ -1978,7 +1978,7 @@ namespace YLErp.Modules.SwapModule
             var openFlowEvents = unwindEvents.Where(x => x.EventType == (int)SwapFlowEventTypeEnum.开仓).ToList();
             decimal unwindQty = unwindFlowEvents.Sum(s => s.Quantity);
             decimal openQty = openFlowEvents.Sum(s => s.Quantity);
-            curretEod.PosiQuantity = QuantityRollforward.Calc(eod.PosiQuantity, openQty, unwindQty);
+            curretEod.PosiQuantity = QtyRollforward.Calc(eod.PosiQuantity, openQty, unwindQty);
             if (unwindEvents.Count == 0)
             {
                 curretEod.PosiNetPrice = position.PosiNetPrice;