refactor(swap-test): 抽取 TestableSwapEodPositionService 公共基类收敛重复 Stub

- 新建 TestableSwapEodPositionService 收敛 8/8 Stub 重复的高频 override
  (PersistEodSwapPosition/SaveAllChanges/GetCurrencyRate/AddClientCash)
  + 统一 OptUserInfo 构造 + PersistedPositions/SaveChangesCount 输出捕获
- SwapEodPositionService.DealInterests 改 protected virtual（行为零变化）
- 8 个 ScenarioTest 改为继承基类，删除重复 override
- 消灭 DealInterestsScenarioTest/DealInterestsGoldenReplayTest 的反射调用
  (typeof().GetMethod().Invoke → 直接调用 DealInterests)

验证：dotnet build 0 错误；dotnet test SwapModule 284通过/6跳过/0失败

UnitTestProject/Modules/SwapModule/SwapPositionComposeScenarioTest.cs

@@ -23,7 +23,7 @@ namespace YLErp.Modules.SwapModule
         /// 继承 SwapEodPositionService，override SwapPositionCompose 路径上的 seam。
         /// 适配当前分支 seam 签名（GetUnderlyingPrice 带 out、GetCurrencyRate 返回 double 等）。
         /// </summary>
-        private sealed class TestableSwapEodService : SwapEodPositionService
+        private sealed class TestableSwapEodService : TestableSwapEodPositionService
         {
             private readonly List<trade> _trades;
             private readonly List<swap_position> _positions;
@@ -34,15 +34,15 @@ namespace YLErp.Modules.SwapModule
             private readonly decimal _price;
             private readonly decimal _vobp;
 
-            public List<eod_swap_position> CreatedEodPositions { get; } = new();
-            public List<(double amount, string action)> ClientCashCalls { get; } = new();
+            // 输出别名（转发到基类捕获属性）
+            public List<eod_swap_position> CreatedEodPositions => PersistedPositions;
 
             public TestableSwapEodService(
                 List<trade> trades, List<swap_position> positions,
                 List<eod_swap_position> eodPositions, List<eod_swap> eodSwaps,
                 List<trade_extend> extends, List<swap_flow_event> flowEvents,
                 decimal price = 100m, decimal vobp = 0m)
-                : base(new OptUserInfo(0, nameof(SwapPositionComposeScenarioTest), OptUserFrom.UnitTest))
+                : base(nameof(SwapPositionComposeScenarioTest))
             {
                 _trades = trades; _positions = positions; _eodPositions = eodPositions;
                 _eodSwaps = eodSwaps; _extends = extends; _flowEvents = flowEvents;
@@ -67,13 +67,9 @@ namespace YLErp.Modules.SwapModule
             { vobp = _vobp; return _price; }
             protected override decimal CalcBondPayment(string underlyingCode, DateTime fromDate, DateTime toDate, decimal qty, int shortRatio, int directionRatio) => 0m;
 
-            // 持久化/事务 seam override
-            protected override void PersistEodSwapPosition(eod_swap_position position) { CreatedEodPositions.Add(position); }
+            // 持久化/事务 seam override（PersistEodSwapPosition/SaveAllChanges/GetCurrencyRate/AddClientCash 由基类提供）
             protected override void SaveEodSwapRecord(trade td, DateTime settleDate, DateTime preSettleDate) { }
-            protected override void SaveAllChanges() { }
             protected override void ExecuteInTransaction(Action action) => action();
-            protected override int AddClientCash(trade td, double amount, string action, DateTime valueDate)
-            { ClientCashCalls.Add((amount, action)); return ClientCashCalls.Count; }
             protected override void ClearSwapPositionsForCompose(trade td, DateTime tradeDate, List<int> eventTypes) { }
             public override void ClearSwapPositions(trade td, DateTime valueDate, List<int> eventTypes, bool delAfter) { }
             protected override swap_event AddSwapEvent(DateTime tradeDate, int swapTradeId, int eventType, string data, int clientCashId, bool save, string reason)
@@ -85,7 +81,6 @@ namespace YLErp.Modules.SwapModule
                 decimal closePosiNotionalValue, decimal closePrecent, int eventType, bool tdClose, bool needPrice,
                 decimal grossPrice, decimal orginPv, bool add = false, bool settment = true, bool newCalcLast = false,
                 List<swap_flow_event> closeList = null) => new List<swap_flow_event>();
-            protected override double GetCurrencyRate(string quoteCurrency, string settlementCurrency, DateTime valueDate, bool seekPreday, CurrencyRateType currencyRateType) => 1.0;
 
             public void ExecuteSwapPositionCompose(DateTime settleDate, DateTime preSettleDate)
                 => SwapPositionCompose(settleDate, preSettleDate, null);