feat(exam): 实现按学生批量生成并下载试题功能

- 增加学生多选功能和生成试题按钮，支持批量操作
- 新增ExamGenerateDialog组件，提供选择年级和难度界面
- 设计后端接口支持多个学生ID，生成对应的试题文档
- 在后端实现批量生成Word文档并压缩打包下载
- 新增StudentDetail业务对象，完善学生信息展示
- 优化了Mapper接口及XML，支持批量查询学生和班级数据
- 提供前端API封装用于调用试题生成和下载服务
- 实现下载失败时的错误处理与提示机制

enlish-service/src/main/resources/mapper/ClassDOMapper.xml

@@ -23,5 +23,14 @@
         from `class`
     </select>
 
+    <select id="selectClassDOListByIds" resultType="com.yinlihupo.enlish.service.domain.dataobject.ClassDO">
+        select *
+        from `class`
+        where id in
+        <foreach collection="classIds" item="classId" separator="," close=")" open="(" index="">
+            #{classId}
+        </foreach>
+    </select>
+
 
 </mapper>

enlish-service/src/main/resources/mapper/StudentDOMapper.xml

@@ -38,4 +38,13 @@
         from student
         where id = #{id}
     </select>
+
+    <select id="selectStudentDOListByIds" resultMap="BaseResultMap">
+        select *
+        from student
+        where id in
+        <foreach item="id" collection="ids" separator="," open="(" close=")" index="index">
+            #{id}
+        </foreach>
+    </select>
 </mapper>