feat(student): 实现学生的新增与删除功能

- 新增AddStudentReqVO和DeleteStudentReqVO请求对象
- 在StudentController中添加新增和删除学生接口
- StudentService及其实现类增加新增和删除学生方法
- 通过StudentDOMapper新增插入和逻辑删除方法
- 新增AddStudentDialog组件，实现学生添加的表单及交互
- 在class.vue页面添加新增学生按钮及删除学生操作列
- API层新增addStudent和deleteStudent接口调用
- 删除学生时更新选中状态及重新加载学生列表
- 初始化新增学生时词汇掌握记录相关数据

enlish-vue/src/pages/class.vue

@@ -57,6 +57,11 @@
                             <el-table-column prop="name" label="姓名" min-width="120" />
                             <el-table-column prop="classId" label="班级ID" width="100" />
                             <el-table-column prop="gradeId" label="年级ID" width="100" />
+                            <el-table-column label="操作" width="120" fixed="right">
+                                <template #default="{ row }">
+                                    <el-button type="danger" size="small" @click.stop="onDeleteStudent(row)">删除</el-button>
+                                </template>
+                            </el-table-column>
                         </el-table>
                         <div class="mt-4 flex justify-end">
                             <el-pagination background layout="prev, pager, next, sizes, total"
@@ -65,6 +70,15 @@
                         </div>
                         <ExamGenerateDialog v-model="showGenerateDialog" :student-ids="selectedStudentIds"
                             :default-grade-id="selectedGradeId" />
+                            <div class="mt-3 flex justify-end">
+                                <el-button type="primary" @click="showAddStudentDialog = true">新增学生</el-button>
+                            </div>
+                        <AddStudentDialog
+                            v-model="showAddStudentDialog"
+                            :default-class-id="selectedClassId"
+                            :default-grade-id="selectedGradeId"
+                            @success="fetchStudents"
+                        />
                     </div>
 
                     <div class="bg-white dark:bg-gray-800 rounded-lg shadow p-6" v-loading="gradeLoading">
@@ -103,10 +117,11 @@ import Header from '@/layouts/components/Header.vue'
 import { ref, onMounted } from 'vue'
 import { getClassList, deleteClass } from '@/api/class'
 import { getGradeList } from '@/api/grade'
-import { getStudentList } from '@/api/student'
+import { getStudentList, deleteStudent } from '@/api/student'
 import ExamGenerateDialog from '@/layouts/components/ExamGenerateDialog.vue'
 import AddClassDialog from '@/layouts/components/AddClassDialog.vue'
 import AddGradeDialog from '@/layouts/components/AddGradeDialog.vue'
+import AddStudentDialog from '@/layouts/components/AddStudentDialog.vue'
 
 const classes = ref([])
 const pageNo = ref(1)
@@ -137,6 +152,7 @@ const studentName = ref('')
 const studentTableRef = ref(null)
 const selectedStudentIds = ref([])
 const showGenerateDialog = ref(false)
+const showAddStudentDialog = ref(false)
 
 async function fetchClasses() {
     loading.value = true
@@ -233,6 +249,19 @@ function onGradeRowClick(row) {
     studentPageNo.value = 1
     fetchStudents()
 }
+async function onDeleteStudent(row) {
+    try {
+        await deleteStudent(row.id)
+        ElMessage.success('删除成功')
+        if (selectedStudentIds.value?.length) {
+            selectedStudentIds.value = selectedStudentIds.value.filter(id => id !== row.id)
+            studentTableRef.value?.toggleRowSelection(row, false)
+        }
+        await fetchStudents()
+    } catch (e) {
+        ElMessage.error('删除失败')
+    }
+}
 async function onDeleteClass(row) {
     try {
         await deleteClass(row.id)