feat：完善信息

config/system.go

@@ -20,6 +20,14 @@ const (
 	WechatForAppID string = "appid"
 )
 
+const (
+	EmailForAlias string = "email_alias" // 邮件别名
+	EmailForHost  string = "email_host"  // 邮件Host
+	EmailForPort  string = "email_port"  // 邮件端口地址
+	EmailForUser  string = "email_user"  // 邮件用户
+	EmailForPass  string = "email_pass"  // 邮件密码；定义邮箱服务器连接信息，如果是阿里邮箱 email_pass填密码，qq邮箱填授权码
+)
+
 const (
 	UploadPath   string = "upload_path"   // 上传路径
 	UploadExt    string = "upload_ext"    // 上传文件限制