菜单新增link字段

src/Hotline/Settings/SystemMenu.cs

@@ -42,6 +42,12 @@ namespace Hotline.Settings
         /// </summary>
         public bool IsLink { get; set; }
 
+        /// <summary>
+        /// 外部连接
+        /// </summary>
+        [SugarColumn(IsNullable = true)]
+        public string Link { get; set; }
+
         /// <summary>
         /// 路由路径
         /// </summary>