first commit

backend/F9WebAiTest.Domain/Interfaces/SYS/RBAC/Users/IUserRoleWriteRepository.cs

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+using F9WebAiTest.Domain.Entities.SYS.RBAC;
+
+namespace F9WebAiTest.Domain.Interfaces.SYS.RBAC.Users;
+
+/// <summary>
+/// 用户角色关联写仓储：不把 AssignRole 放在 IUserWriteRepository（避免污染聚合仓储），
+/// 而是定义独立的细粒度接口，应用层依赖此抽象，基础设施层实现。
+/// </summary>
+public interface IUserRoleWriteRepository : IDInterface
+{
+    Task<bool> AssignAsync(UserRole userRole);
+
+    Task<bool> RemoveAsync(long userid, long roleId);
+}

backend/F9WebAiTest.Domain/Interfaces/SYS/RBAC/Users/IUserWriteRepository.cs

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+using F9WebAiTest.Domain.Entities.SYS.RBAC;
+
+namespace F9WebAiTest.Domain.Interfaces.SYS.RBAC.Users;
+
+/// <summary>用户写仓储（聚合根仓储）</summary>
+public interface IUserWriteRepository : IDInterface
+{
+    /// <summary>返回聚合根</summary>
+    Task<User> GetByIdAsync(long id);
+
+    Task<bool> AddAsync(User user);
+    Task<bool> UpdateAsync(User user);
+    Task<bool> SoftDeleteAsync(long id);
+    Task<bool> ActiveOrDeactive(long id, bool active);
+
+    Task<bool> UpdatePassworkdAsync(long id, string passwordHash);
+    Task<bool> UpdateLastLoginAtAsync(long id, DateTime dt);
+}