refactor: 公告类型适配字典数据

1.新增 <dict-tag> 自定义组件，用于回显字典标签
2.重构 useDict 方法，支持查询字典数据
3.优化部分字典相关数据类型

continew-admin-system/src/main/resources/mapper/DictItemMapper.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
+<mapper namespace="top.charles7c.cnadmin.system.mapper.DictItemMapper">
+    <select id="listByDictCode" resultType="top.charles7c.cnadmin.common.model.vo.LabelValueVO">
+        SELECT t1.`label`, t1.`value`, t1.`color`
+        FROM `sys_dict_item` AS t1
+        LEFT JOIN `sys_dict` AS t2 ON t1.`dict_id` = t2.`id`
+        WHERE t2.`code` = #{dictCode}
+        ORDER BY t1.`sort` ASC
+    </select>
+</mapper>