fix 省市地区管理

Atomx.Common/Entities/Area.cs

@@ -50,6 +50,11 @@ namespace Atomx.Common.Entities
         [Column(TypeName = "varchar(32)")]
         public string Abbreviation { get; set; } = string.Empty;
 
+        /// <summary>
+        /// 下级地区数量
+        /// </summary>
+        public int Count { get; set; }
+
         /// <summary>
         /// 地区深度
         /// </summary>

Atomx.Common/Models/KeyValueTree.cs

@@ -4,6 +4,6 @@
     {
         public string Label { get; set; } = string.Empty;
         public string Value { get; set; } = string.Empty;
-        public List<KeyValueTree> Children { get; set; } = new List<KeyValueTree>();
+        public IList<KeyValueTree> Children { get; set; } = new List<KeyValueTree>();
     }
 }