调整数据库结构，实现消息模板管理

Atomx.Common/Entities/Setting.cs

@@ -22,13 +22,7 @@ namespace Atomx.Common.Entities
         public long SiteId { get; set; }
 
         /// <summary>
-        /// 系统设置KEY
-        /// </summary>
-        [Column(TypeName = "varchar(64)")]
-        public string Key { get; set; } = string.Empty;
-
-        /// <summary>
-        /// 配置类型,0 系统设置，
+        /// 配置类型,见 SettingType 枚举
         /// </summary>
         public int Type { get; set; }
 
@@ -38,6 +32,12 @@ namespace Atomx.Common.Entities
         [Column(TypeName = "varchar(64)")]
         public string Name { get; set; } = string.Empty;
 
+        /// <summary>
+        /// 系统设置KEY
+        /// </summary>
+        [Column(TypeName = "varchar(64)")]
+        public string Key { get; set; } = string.Empty;
+
         /// <summary>
         /// 系统设置项
         /// </summary>