fix(swap): 修复债券结息价差盈亏计算逻辑

- 将价差盈亏计算从使用CloseNotionalValue改为使用PositionQty和ContractSize
- 更新前端JavaScript代码中的计算公式，按持仓数量和合约乘数计算价差盈亏
- 在UnwindInput模型中添加PositionQty和ContractSize字段
- 修正后台计算服务中的数据映射逻辑
- 添加FC_009测试用例验证债券价差按数量计算的正确性
- 更新现有测试用例的输入参数以匹配新的计算方式

YLErpWeb/fe-tests/swapCalc.test.js

@@ -222,7 +222,8 @@ describe('交叉校验：对齐 C# FrontendCalcCharacterizationTest 金标准',
     test('FC_006 结息 债券多头 全量', () => {
         const r = SwapCalc.calcIncome({
             multiplier: 100, posiGrossPrice: 1.02, tradingAmountAvg: 105,
-            closeNotionalValue: 10000, closeQty: 0, payDirection: 1, positionType: 1,
+            positionQty: 10000, contractSize: 1,
+            closeNotionalValue: 10200, closeQty: 0, payDirection: 1, positionType: 1,
             tradingFee: '0', tradingFeePending: '0', dividendIn: '0'
         });
         expectClose(r.MarkClosePnl, 300, 'income MarkClosePnl');
@@ -233,7 +234,8 @@ describe('交叉校验：对齐 C# FrontendCalcCharacterizationTest 金标准',
     test('FC_007 结息 改标的价格', () => {
         const r = SwapCalc.calcIncome({
             multiplier: 100, posiGrossPrice: 1.02, tradingAmountAvg: 110,
-            closeNotionalValue: 10000, closeQty: 0, payDirection: 1, positionType: 1,
+            positionQty: 10000, contractSize: 1,
+            closeNotionalValue: 10200, closeQty: 0, payDirection: 1, positionType: 1,
             tradingFee: '0', tradingFeePending: '0', dividendIn: '0'
         });
         expectClose(r.MarkClosePnl, 800, '改价格后 income MarkClosePnl');
@@ -243,7 +245,8 @@ describe('交叉校验：对齐 C# FrontendCalcCharacterizationTest 金标准',
     test('FC_008 结息 含利息腿与预付金腿 总额', () => {
         const r = SwapCalc.calcIncome({
             multiplier: 100, posiGrossPrice: 1.02, tradingAmountAvg: 105,
-            closeNotionalValue: 10000, closeQty: 0, payDirection: 1, positionType: 1,
+            positionQty: 10000, contractSize: 1,
+            closeNotionalValue: 10200, closeQty: 0, payDirection: 1, positionType: 1,
             tradingFee: '0', tradingFeePending: '0', dividendIn: '0',
             interestLegs: [{ interestClosePnL: 100 }],
             marginLegs: [{ interestClosePnL: 50 }]
@@ -251,4 +254,17 @@ describe('交叉校验：对齐 C# FrontendCalcCharacterizationTest 金标准',
         expectClose(r.SwapRealizedPnL, 450, '含利息+预付金 SwapRealizedPnL');
         expectClose(r.SwapMarginRebatePnl, 50, 'SwapMarginRebatePnl');
     });
+
+    // FC_009 真实回归：债券结息价差按数量计算，不能误用期初名义本金
+    test('FC_009 结息 债券价差按数量计算', () => {
+        const r = SwapCalc.calcIncome({
+            multiplier: 100, posiGrossPrice: 0.98, tradingAmountAvg: 80,
+            positionQty: 30000000, contractSize: 1,
+            closeNotionalValue: 29400000, closeQty: 0,
+            payDirection: 2, positionType: 1,
+            tradingFee: '0', tradingFeePending: '0', dividendIn: '-45000'
+        });
+        expectClose(r.MarkClosePnl, 5400000, 'income MarkClosePnl按数量计算');
+        expectClose(r.FloatPnlSum, 5355000, 'income FloatPnlSum包含分红');
+    });
 });