first commit

backend/F9WebAiTest.Application/Interfaces/UOW/IUnitOfWork_F9.cs

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+namespace F9WebAiTest.Application.Interfaces.UOW;
+
+/// <summary>工作单元：在事务内执行一组操作（简化版，替代 F9 的 Begin/Commit/Rollback）</summary>
+public interface IUnitOfWork_F9
+{
+    /// <summary>在事务内执行操作，返回是否提交成功（异常自动回滚）</summary>
+    Task<bool> ExecuteWithUow(Func<Task<bool>> func);
+}