feat: 更新分期方案初始化脚本，匹配最新表结构

- 更新表名和字段名为小写格式
- 修正字段类型以匹配实体类定义
- 新增缺失字段：scheme_type, down_payment_ratio等
- 添加索引优化查询性能
- 完善表和字段注释

mapper/system/SysRoleMapper.xml

@@ -0,0 +1,59 @@
+<?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="org.dromara.system.mapper.SysRoleMapper">
+
+    <resultMap type="org.dromara.system.domain.vo.SysRoleVo" id="SysRoleResult">
+    </resultMap>
+
+    <sql id="selectRoleVo">
+        select distinct r.role_id,
+                        r.role_name,
+                        r.role_key,
+                        r.role_sort,
+                        r.data_scope,
+                        r.menu_check_strictly,
+                        r.dept_check_strictly,
+                        r.status,
+                        r.del_flag,
+                        r.create_time,
+                        r.remark
+        from sys_role r
+                 left join sys_user_role sur on sur.role_id = r.role_id
+                 left join sys_user u on u.user_id = sur.user_id
+                 left join sys_dept d on u.dept_id = d.dept_id
+    </sql>
+
+    <select id="selectPageRoleList" resultMap="SysRoleResult">
+        <include refid="selectRoleVo"/>
+        ${ew.getCustomSqlSegment}
+    </select>
+
+    <select id="selectRoleList" resultMap="SysRoleResult">
+        <include refid="selectRoleVo"/>
+        ${ew.getCustomSqlSegment}
+    </select>
+
+    <select id="selectRolePermissionByUserId" parameterType="Long" resultMap="SysRoleResult">
+        <include refid="selectRoleVo"/>
+        WHERE r.del_flag = '0' and sur.user_id = #{userId}
+    </select>
+
+    <select id="selectRolesByUserId" parameterType="Long" resultMap="SysRoleResult">
+        select r.role_id,
+               r.role_name,
+               r.role_key,
+               r.role_sort,
+               r.data_scope,
+               r.status
+        from sys_role r
+        WHERE r.del_flag = '0' and r.role_id in (select role_id from sys_user_role where user_id = #{userId})
+    </select>
+
+    <select id="selectRoleById" resultMap="SysRoleResult">
+        <include refid="selectRoleVo"/>
+        WHERE r.del_flag = '0' and r.role_id = #{roleId}
+    </select>
+
+</mapper>