first commit

backend/F9WebAiTest.Domain/Entities/SYS/RBAC/UserRole.cs

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+using FreeSql.DataAnnotations;
+
+namespace F9WebAiTest.Domain.Entities.SYS.RBAC;
+
+/// <summary>
+/// 用户角色关联：用户与角色的多对多关系。
+/// DDD 中作为独立关联实体，应用层直接操作其仓储（不通过 User 聚合）。
+/// </summary>
+[Table(Name = "sys_rbac_user_roles")]
+public class UserRole : BusinessEntity
+{
+    [Column(Name = "user_id")]
+    public long UserId { get; private set; }
+
+    [Column(Name = "role_id")]
+    public long RoleId { get; private set; }
+
+    public UserRole() { }
+
+    public UserRole(long id, long userId, long roleId)
+    {
+        Id = id;
+        UserId = userId;
+        RoleId = roleId;
+        CreatedAt = DateTime.UtcNow;
+    }
+}