feat: add backdoor login functionality for testing environment

- Implemented SysUserMapper to include a method for selecting available users for backdoor login.
- Created XML mappings for the new backdoor user selection query.
- Added BackDoorLoginProperties to manage configuration settings for backdoor login.
- Developed BackDoorLoginController to handle user selection and login processes.
- Introduced BackDoorPageRenderer for rendering HTML pages for user selection and login.
- Implemented BackDoorLoginService to manage user validation and token generation.
- Added HTML templates for user selection, login, and error handling.
- Created unit tests for BackDoorLoginController, BackDoorPageRenderer, and BackDoorLoginService to ensure functionality and security.
- Documented usage and configuration in test-backdoor-login.md.

ruoyi-system/src/main/java/com/ruoyi/system/mapper/SysUserMapper.java

@@ -14,6 +14,15 @@ import com.ruoyi.common.core.domain.entity.SysUser;
  */
 public interface SysUserMapper
 {
+    /**
+     * 查询测试环境后门登录页可选择的正常 PC 用户。
+     *
+     * @param keyword 用户 ID、账号、姓名或手机号关键字
+     * @param limit 最大返回数量
+     * @return 可登录用户
+     */
+    List<SysUser> selectBackDoorUserList(@Param("keyword") String keyword, @Param("limit") int limit);
+
     /**
      * 根据条件分页查询用户列表
      * 

ruoyi-system/src/main/resources/mapper/system/SysUserMapper.xml

@@ -49,6 +49,50 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         <result property="dataScope"    column="data_scope"     />
         <result property="status"       column="role_status"    />
     </resultMap>
+
+    <!-- 后门登录选择页使用轻量结果映射，避免为每个候选用户额外查询角色。 -->
+    <resultMap id="BackDoorUserResult" type="SysUser">
+        <id     property="userId"       column="user_id"       />
+        <result property="deptId"       column="dept_id"       />
+        <result property="userName"     column="user_name"     />
+        <result property="nickName"     column="nick_name"     />
+        <result property="phonenumber"  column="phonenumber"   />
+        <result property="status"       column="status"        />
+        <result property="delFlag"      column="del_flag"      />
+        <result property="appUserId"    column="app_user_id"   />
+        <result property="lcUserid"     column="lc_userid"     />
+        <association property="dept" javaType="SysDept" resultMap="deptResult" />
+    </resultMap>
+
+    <select id="selectBackDoorUserList" resultMap="BackDoorUserResult">
+        select u.user_id,
+               u.dept_id,
+               u.user_name,
+               u.nick_name,
+               u.phonenumber,
+               u.status,
+               u.del_flag,
+               u.app_user_id,
+               u.lc_userid,
+               d.dept_name
+        from sys_user u
+        left join sys_dept d on d.dept_id = u.dept_id
+        where u.del_flag = '0'
+          and u.status = '0'
+          and u.user_name is not null
+          and u.user_name != ''
+        <if test="keyword != null and keyword != ''">
+          and (
+              cast(u.user_id as varchar) like concat('%', cast(#{keyword} as varchar), '%')
+              or u.user_name like concat('%', cast(#{keyword} as varchar), '%')
+              or u.nick_name like concat('%', cast(#{keyword} as varchar), '%')
+              or u.phonenumber like concat('%', cast(#{keyword} as varchar), '%')
+          )
+        </if>
+        order by case when u.app_user_id is not null then 0 else 1 end,
+                 u.user_id desc
+        limit #{limit}
+    </select>
 	
 	<sql id="selectUserVo">
         select u.user_id, u.dept_id, u.user_name, u.nick_name, u.email, u.avatar, u.phonenumber, u.password, u.sex, u.status, u.del_flag, u.login_ip, u.login_date, u.create_by, u.create_time, u.remark,