授信/现金资金标签分配链路 double→decimal 精度收敛

- FundTagCalc 全链路（LegAmount/LegFundPlan/UnwindTagSplit/TagRelease/MarginLegSettlement）金额类型改 decimal，消除 double 二进制误差在拆单倒挤、守恒校验中的分位尾差
- 边界处显式转换：writeCash 委托与 ClientCreditInoutService.Occupy/Release（仍 double）、GetAvailableCredit 返回值 (decimal) 强转
- SwapDealService.RecordMarginCashFlow/ReleaseMarginByFundTag 签名同步 decimal，测试桩 TestableSwapDealService 对齐
- 单测断言去掉 1e-6 容差（decimal 精确比较）

UnitTestProject/Modules/SwapModule/FundTagCalcTest.cs

@@ -11,7 +11,7 @@ namespace YLErp.Modules.SwapModule
     [TestClass]
     public class FundTagCalcTest
     {
-        private static LegAmount Leg(long id, double amount, bool preferCredit)
+        private static LegAmount Leg(long id, decimal amount, bool preferCredit)
             => new() { Leg = new swap_position { id = id }, Amount = amount, PreferCredit = preferCredit };
 
         // ================================================================
@@ -273,7 +273,7 @@ namespace YLErp.Modules.SwapModule
                     InterestPrincipalFix = fix,
                     FundTag = preferCredit ? ConsFundTag.Credit : ConsFundTag.Cash
                 },
-                Amount = (double)fix,
+                Amount = fix,
                 PreferCredit = preferCredit
             };
 

UnitTestProject/Modules/SwapModule/Margin/SwapAdditionalMarginLegTest.cs

@@ -71,8 +71,8 @@ namespace YLErp.Modules.SwapModule
                 new List<LegAmount> { new() { Leg = leg, Amount = 1000, PreferCredit = true } },
                 creditAvailable: 5_000, ignoreMoneyCheck: false);
 
-            Assert.AreEqual(1000, plans[0].CreditAmount, 1e-6);
-            Assert.AreEqual(0, plans[0].CashAmount, 1e-6);
+            Assert.AreEqual(1000, plans[0].CreditAmount);
+            Assert.AreEqual(0, plans[0].CashAmount);
             Assert.IsFalse(plans[0].NeedSplit);
             //CashAmount==0 → ApplyMarginFundTags 不写现金流水；占用 remark 前缀断言
             Assert.IsTrue((ClientCreditInoutService.AdditionalMarginRemark + "占用")
@@ -94,8 +94,8 @@ namespace YLErp.Modules.SwapModule
             var legs = new List<LegAmount> { new() { Leg = leg, Amount = 1000, PreferCredit = true } };
             var plans = FundTagCalc.AllocateByLegPreference(legs, creditAvailable: 300, ignoreMoneyCheck: false);
             Assert.IsTrue(plans[0].NeedSplit);
-            Assert.AreEqual(300, plans[0].CreditAmount, 1e-6);
-            Assert.AreEqual(700, plans[0].CashAmount, 1e-6);
+            Assert.AreEqual(300, plans[0].CreditAmount);
+            Assert.AreEqual(700, plans[0].CashAmount);
 
             //ApplySaveTimeSplit 与 SplitLeg 同口径（原腿=授信部分、克隆现金腿倒挤守恒）
             var newLegs = FundTagCalc.ApplySaveTimeSplit(legs, plans);
@@ -126,8 +126,8 @@ namespace YLErp.Modules.SwapModule
                 new List<LegAmount> { new() { Leg = leg, Amount = 1000, PreferCredit = false } },
                 creditAvailable: 5_000, ignoreMoneyCheck: false);
 
-            Assert.AreEqual(0, plans[0].CreditAmount, 1e-6);
-            Assert.AreEqual(1000, plans[0].CashAmount, 1e-6);
+            Assert.AreEqual(0, plans[0].CreditAmount);
+            Assert.AreEqual(1000, plans[0].CashAmount);
             Assert.IsFalse(plans[0].NeedSplit);
         }
 

UnitTestProject/Modules/SwapModule/TestableSwapDealService.cs

@@ -141,10 +141,10 @@ namespace YLErp.Modules.SwapModule
             return ReleaseMarginByFundTagResult
                 ?? new UnwindTagSplit
                 {
-                    CashMargin = Convert.ToDouble(marginAmount),
-                    CashRebate = Convert.ToDouble(marginLegs.Any()
+                    CashMargin = marginAmount,
+                    CashRebate = marginLegs.Any()
                         ? marginLegs.Sum(x => x.InterestClosePnL)
-                        : marginRebate)
+                        : marginRebate
                 };
         }