wip: 🧠 初步的框架

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

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+using NetAdmin.Domain.DbMaps.Dependency;
+
+namespace NetAdmin.Domain.DbMaps.Sys;
+
+/// <summary>
+///     角色-菜单映射表
+/// </summary>
+[Table(Name = Chars.FLG_TABLE_NAME_PREFIX + nameof(Sys_RoleMenu))]
+[Index($"idx_{{tablename}}_{nameof(RoleId)}_{nameof(MenuId)}", $"{nameof(RoleId)},{nameof(MenuId)}", true)]
+public record Sys_RoleMenu : ImmutableEntity
+{
+    /// <summary>
+    ///     关联的菜单
+    /// </summary>
+    [JsonIgnore]
+    public Sys_Menu Menu { get; init; }
+
+    /// <summary>
+    ///     菜单编号
+    /// </summary>
+    [JsonIgnore]
+    [Column]
+    public virtual long MenuId { get; init; }
+
+    /// <summary>
+    ///     关联的角色
+    /// </summary>
+    [JsonIgnore]
+    public Sys_Role Role { get; init; }
+
+    /// <summary>
+    ///     角色编号
+    /// </summary>
+    [JsonIgnore]
+    [Column]
+    public virtual long RoleId { get; init; }
+}