cleanup: 删除死代码枚举 mode 3/4/7/8 及相关引用

mode 3(持仓名义本金)/4(持仓市值): 零引用死代码
mode 7/8(多空存续名义本金): 界面已禁用, 无历史数据(用户确认)

删除:
- InterestModeEnum: 移除 持仓名义本金/持仓市值/多头存续名义本金/空头存续名义本金
  枚举值保持显式(1/2/5/6/9), DB契约不变
- CalcNotionalByMode: 移除 mode 7/8 的 case
- ConsTrade.InterestModels/InterestNotionalModels: 移除 mode 7/8
- 删除3个 mode 7/8 相关测试方法(场景已不存在)

CalcNotionalByMode 现在只剩 mode 5/6(保证金)的 case,
待 Margin 独立计息入口建成后整体删除。
验证: 编译0错误, 全量508测试7失败(基线一致)。

Framework/YLErp.Core/DBModels/Consts/ConsTrade.cs

@@ -131,11 +131,11 @@ namespace YLErp.DBModels
         /// <summary>
         /// 互换利率端计息方式
         /// </summary>
-        public static readonly List<int> InterestModels = new List<int>() { (int)InterestModeEnum.固定值, (int)InterestModeEnum.合约名义本金规模, (int)InterestModeEnum.空头存续名义本金,(int)InterestModeEnum.多头存续名义本金, (int)InterestModeEnum.标的期初全价 };
+        public static readonly List<int> InterestModels = new List<int>() { (int)InterestModeEnum.固定值, (int)InterestModeEnum.合约名义本金规模, (int)InterestModeEnum.标的期初全价 };
         /// <summary>
         /// 互换利率端计息方式-名义本金相关
         /// </summary>
-        public static readonly List<int> InterestNotionalModels = new List<int>() {(int)InterestModeEnum.合约名义本金规模, (int)InterestModeEnum.空头存续名义本金, (int)InterestModeEnum.多头存续名义本金, (int)InterestModeEnum.标的期初全价 };
+        public static readonly List<int> InterestNotionalModels = new List<int>() {(int)InterestModeEnum.合约名义本金规模, (int)InterestModeEnum.标的期初全价 };
         /// <summary>
         /// 互换利率计息方式 预付金
         /// </summary>

Framework/YLErp.Core/DBModels/Enums/InterestModeEnum.cs

@@ -14,12 +14,8 @@ namespace YLErp.DBModels
         Unknown = 0,
         固定值 = 1,
         合约名义本金规模 = 2,
-        持仓名义本金 = 3,
-        持仓市值 = 4,
         初始预付金 = 5,
         追加预付金 = 6,
-        多头存续名义本金 = 7,
-        空头存续名义本金 = 8,
         标的期初全价 = 9
     }
     /// <summary>

UnitTestProject/Modules/SwapModule/FundingLegs/FundingLegStrategyTest.cs

@@ -121,10 +121,9 @@ namespace UnitTestProject.Modules.SwapModule.FundingLegs
         [TestMethod]
         public void 工厂_未注册mode抛异常()
         {
+            // mode 3/4/7/8 已从枚举删除，用 Unknown(0)验证未注册抛异常
             Assert.ThrowsException<ArgumentException>(() =>
-                FundingLegStrategyFactory.Get(InterestModeEnum.持仓名义本金));
-            Assert.ThrowsException<ArgumentException>(() =>
-                FundingLegStrategyFactory.Get(InterestModeEnum.持仓市值));
+                FundingLegStrategyFactory.Get(InterestModeEnum.Unknown));
             Assert.ThrowsException<ArgumentException>(() =>
                 FundingLegStrategyFactory.Get(InterestModeEnum.初始预付金));
             Assert.ThrowsException<ArgumentException>(() =>

UnitTestProject/Modules/SwapModule/SwapUnwindFloatingLegDiagnosticTdd.cs

@@ -94,19 +94,5 @@ namespace YLErp.Modules.SwapModule
             Assert.AreEqual(RealFix * ClosePct, close, "mode5 应 = 实时腿剩余本金(real Fix) * closePct，与 posiLong(orig 100M) 无关");
             Assert.AreNotEqual(OrigFix * ClosePct, close, "务必不是期初 99,000 * closePct（证明后端修复生效）");
         }
-
-        [TestMethod]
-        public void 诊断_若将来有_多头存续名义本金_腿_posiLong用orig才出错_本deal无此腿_故不影响()
-        {
-            // 构造一个「多头存续名义本金」腿，证明此时 posiLong 取值(orig vs real)会直接决定结果——
-            // 说明本 deal 没有这种腿，所以 fpositions 用 orig 100M 不影响；但普通收益互换若有此腿则会踩坑。
-            var longLeg = new swap_position { id = 35799, InterestMode = (int)InterestModeEnum.多头存续名义本金 };
-            var byOrig = CallCalcNotionalByMode(longLeg, ClosePct, RealLong * ClosePct, OrigLong, 0m);   // 当前代码：posiLong=orig 100M
-            var byReal = CallCalcNotionalByMode(longLeg, ClosePct, RealLong * ClosePct, RealLong, 0m);  // 若修正为 real 75.6M
-            Console.WriteLine($"[多头存续名义本金] orig100M→close={byOrig.close} ; real75.6M→close={byReal.close}");
-            Assert.AreEqual(OrigLong * ClosePct, byOrig.close, "现状：多头存续名义本金用 orig 100M → 多次部分平仓后会偏大");
-            Assert.AreEqual(RealLong * ClosePct, byReal.close, "正确应：用 real 剩余本金 75.6M");
-            Assert.AreNotEqual(byOrig.close, byReal.close, "★ 潜在同类 bug：普通收益互换(含多头/空头存续名义本金腿)在多次部分平仓后，posiLong/posiShort 用 orig 会算错——本 deal 无此腿故不触发，属本轮修复范围外");
-        }
     }
 }

UnitTestProject/Modules/SwapModule/SwapUnwindPrepayPrincipalBugTdd.cs

@@ -505,27 +505,6 @@ namespace YLErp.Modules.SwapModule
             Assert.AreEqual(918_000m, fe1.InterestPrincipal, "追加预付金 10% 应=Fix×0.1");
         }
 
-        // ---- 多头/空头存续名义本金(7/8)：经同一 CalcDailySimpleInterest，需证明修复通用 ----
-        [TestMethod]
-        public void 多头存续名义本金腿_盘中_部分平仓重置周期7天_应线性缩放()
-        {
-            const decimal baseP = 2_000_000m;
-            var fe = CalcByMode((int)InterestModeEnum.多头存续名义本金, baseP, 0.5m);
-            Assert.AreEqual(1_000_000m, fe.InterestPrincipal, "多头存续 50% 应=posiLong×0.5");
-            var fe1 = CalcByMode((int)InterestModeEnum.多头存续名义本金, baseP, 0.1m);
-            Assert.AreEqual(200_000m, fe1.InterestPrincipal, "多头存续 10% 应=posiLong×0.1");
-        }
-
-        [TestMethod]
-        public void 空头存续名义本金腿_盘中_部分平仓重置周期7天_应线性缩放()
-        {
-            const decimal baseP = 2_000_000m;
-            var fe = CalcByMode((int)InterestModeEnum.空头存续名义本金, baseP, 0.5m);
-            Assert.AreEqual(1_000_000m, fe.InterestPrincipal, "空头存续 50% 应=posiShort×0.5");
-            var fe1 = CalcByMode((int)InterestModeEnum.空头存续名义本金, baseP, 0.1m);
-            Assert.AreEqual(200_000m, fe1.InterestPrincipal, "空头存续 10% 应=posiShort×0.1");
-        }
-
         // ---- 合约名义本金规模(2)：CalcNotionalByMode 默认分支（posiNotional×cp） ----
         [TestMethod]
         public void 合约名义本金规模腿_盘中_部分平仓重置周期7天_应线性缩放()

YLErpDAL/Modules/SwapModule/SwapDealService.cs

@@ -937,14 +937,6 @@ namespace YLErp.Modules.SwapModule
 
             switch (mode)
             {
-                case InterestModeEnum.多头存续名义本金:
-                    closePrincipal = posiLong * closePercent;
-                    posiPrincipal = posiLong;
-                    break;
-                case InterestModeEnum.空头存续名义本金:
-                    closePrincipal = posiShort * closePercent;
-                    posiPrincipal = posiShort;
-                    break;
                 case InterestModeEnum.追加预付金:
                 case InterestModeEnum.初始预付金:
                     closePrincipal = position.InterestPrincipalFix * closePercent;