first commit

backend/F9WebAiTest.Domain/Interfaces/SYS/Departments/IDepartmentUserRepository.cs

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+using F9WebAiTest.Domain.Entities.SYS.Departments;
+
+namespace F9WebAiTest.Domain.Interfaces.SYS.Departments;
+
+/// <summary>部门用户关联写仓储</summary>
+public interface IDepartmentUserRepository : IDInterface
+{
+    Task<bool> AssignAsync(DepartmentUser depUser);
+
+    Task<bool> RemoveAsync(long depId, long userId);
+}

backend/F9WebAiTest.Domain/Interfaces/SYS/Departments/IDepartmentWriteRepository.cs

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+using F9WebAiTest.Domain.Entities.SYS.Departments;
+
+namespace F9WebAiTest.Domain.Interfaces.SYS.Departments;
+
+/// <summary>部门写仓储（聚合根仓储）</summary>
+public interface IDepartmentWriteRepository : IDInterface
+{
+    /// <summary>返回聚合根</summary>
+    Task<Department> GetByIdAsync(long id, CancellationToken cancellationToken);
+
+    Task<bool> AddAsync(Department dep);
+    Task<bool> UpdateAsync(Department dep);
+    Task<bool> SoftDeleteAsync(long id);
+    Task<bool> ActiveOrDeactive(long id, bool active);
+}