SwapDealService的10个private static纯逻辑方法搬到两个新文件: - UnwindNormalizer.cs: NormalizeNotionalValues/FullCloseRequest/Recalculate/IsFullClose/SettledInterestAmounts/EventUnwindDate (6个) - TradingFeeCalc.cs: CalcInitTradingFee/CalcInitTradingFeePending (2个) SwapDealService内21处调用点加类名前缀, 反射测试改为直接调用(public) SwapModule零回归(7基线/510通过)