wip: 🧠 初步的框架

src/backend/NetAdmin.Domain/DbMaps/Sys/Sys_UserRole.cs

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+using NetAdmin.Domain.DbMaps.Dependency;
+
+namespace NetAdmin.Domain.DbMaps.Sys;
+
+/// <summary>
+///     用户-角色映射表
+/// </summary>
+[Table(Name = Chars.FLG_TABLE_NAME_PREFIX + nameof(Sys_UserRole))]
+public sealed record Sys_UserRole : VersionEntity
+{
+    /// <summary>
+    ///     关联的角色
+    /// </summary>
+    [JsonIgnore]
+    public Sys_Role Role { get; init; }
+
+    /// <summary>
+    ///     角色编号
+    /// </summary>
+    [JsonIgnore]
+    [Column]
+    public long RoleId { get; init; }
+
+    /// <summary>
+    ///     关联的用户
+    /// </summary>
+    [JsonIgnore]
+    public Sys_User User { get; init; }
+
+    /// <summary>
+    ///     用户编号
+    /// </summary>
+    [JsonIgnore]
+    [Column]
+    public long UserId { get; init; }
+}