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-vue/src/pages/class.vue

@@ -35,8 +35,19 @@
                                 selectedGradeId }})</el-tag>
                             <el-button type="primary" @click="fetchStudents">查询</el-button>
                             <el-button @click="resetStudentFilters">重置</el-button>
+                            <el-button type="success" :disabled="selectedStudentIds.length === 0" @click="showGenerateDialog = true">
+                                生成试题
+                            </el-button>
                         </div>
-                        <el-table :data="students" border class="w-full" v-loading="studentLoading">
+                        <el-table
+                            ref="studentTableRef"
+                            :data="students"
+                            border
+                            class="w-full"
+                            v-loading="studentLoading"
+                            @selection-change="onStudentSelectionChange"
+                        >
+                            <el-table-column type="selection" width="48" />
                             <el-table-column prop="id" label="ID" width="80" />
                             <el-table-column prop="name" label="姓名" min-width="120" />
                             <el-table-column prop="classId" label="班级ID" width="100" />
@@ -47,6 +58,11 @@
                                 :total="studentTotalCount" :page-size="studentPageSize" :current-page="studentPageNo"
                                 @current-change="handleStudentPageChange" @size-change="handleStudentSizeChange" />
                         </div>
+                        <ExamGenerateDialog
+                            v-model="showGenerateDialog"
+                            :student-ids="selectedStudentIds"
+                            :default-grade-id="selectedGradeId"
+                        />
                     </div>
 
                     <div class="bg-white dark:bg-gray-800 rounded-lg shadow p-6" v-loading="gradeLoading">
@@ -76,6 +92,7 @@ import { ref, onMounted } from 'vue'
 import { getClassList } from '@/api/class'
 import { getGradeList } from '@/api/grade'
 import { getStudentList } from '@/api/student'
+import ExamGenerateDialog from '@/layouts/components/ExamGenerateDialog.vue'
 
 const classes = ref([])
 const pageNo = ref(1)
@@ -85,6 +102,7 @@ const loading = ref(false)
 const classTableRef = ref(null)
 const selectedClassId = ref(null)
 const selectedClassTitle = ref('')
+
 const grades = ref([])
 const gradePageNo = ref(1)
 const gradePageSize = ref(10)
@@ -93,12 +111,16 @@ const gradeLoading = ref(false)
 const gradeTableRef = ref(null)
 const selectedGradeId = ref(null)
 const selectedGradeTitle = ref('')
+
 const students = ref([])
 const studentPageNo = ref(1)
 const studentPageSize = ref(10)
 const studentTotalCount = ref(0)
 const studentLoading = ref(false)
 const studentName = ref('')
+const studentTableRef = ref(null)
+const selectedStudentIds = ref([])
+const showGenerateDialog = ref(false)
 
 async function fetchClasses() {
     loading.value = true
@@ -178,6 +200,9 @@ function handleStudentSizeChange(s) {
     studentPageNo.value = 1
     fetchStudents()
 }
+function onStudentSelectionChange(rows) {
+    selectedStudentIds.value = rows.map(r => r.id)
+}
 function onClassRowClick(row) {
     selectedClassId.value = row.id
     selectedClassTitle.value = row.title