hjhan
55284fb76b
refactor(margin): 抽出独立 Margin 限界上下文，移除 PrepayLeg 错误继承
- 新建 YLErp.Modules.SwapModule.Margin：MarginBalance / MarginLeg / IMarginResolver(Cash/Credit/Guarantee)
- MarginLeg 不继承 IInterestLegStrategy，与利息腿完全解耦（保证金是客户存款/担保，非互换腿）
- 删除 PrepayLeg，工厂不再注册 mode 5/6 预付金
- 预付金用例迁入 MarginLegTest，旧 InterestLegStrategyTest 改为断言预付金已非利息腿
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