refactor: 目录结构调整和代码优化

src/main/resources/mapper/DictItemMapper.xml

@@ -0,0 +1,24 @@
+<?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="com.youlai.boot.system.mapper.DictItemMapper">
+
+    <!-- 根据字典编码获取字典列表 -->
+    <select id="listDictItemsByDictId" resultType="com.youlai.boot.system.model.vo.DictPageVO$DictItem">
+        SELECT
+            id,
+            `name`,
+            value,
+            sort,
+            status
+        FROM
+            sys_dict_item
+        <where>
+            dict_id = #{dictId}
+        </where>
+        ORDER BY
+            sort ASC
+    </select>
+
+</mapper>