feat(student): 新增学生详情接口及相关服务层支持

- 优化ClassDOMapper，重命名查询方法为selectClassDOById，并移除多余CRUD方法
- 新增ClassService接口及ClassServiceImpl实现，用于通过ID查询班级信息
- 新增GradeDO及GradeDOMapper，实现根据班级ID查询年级信息
- 新增GradeService接口及GradeServiceImpl实现根据班级ID查询年级数据
- StudentDO增加isDeleted和startTime字段，补充学生实体
- StudentDOMapper新增selectStudentById方法实现单个学生信息查询
- StudentService及其实现类新增getStudentById方法提供学生单条数据查询
- StudentController新增/detail接口，实现学生详情查询，返回学生姓名、班级、年级等信息
- 创建FindStudentDetailReqVO和FindStudentDetailRspVO用于请求和响应数据传输
- enlish-vue端新增getStudentDetail接口调用 后台学生详情接口
- 修改ExamWordsDetailCard组件，展示学生姓名及其班级、年级信息，新增fetchStudent异步方法拉取学生详情数据并显示

enlish-vue/src/api/student.js

@@ -0,0 +1,7 @@
+import axios from "@/axios";
+
+export function getStudentDetail(id) {
+    return axios.post('/student/detail', {
+        studentId: id
+    })
+}

enlish-vue/src/layouts/components/ExamWordsDetailCard.vue

@@ -8,8 +8,13 @@
 						<div class="text-base font-medium">{{ detail?.id ?? '-' }}</div>
 					</div>
 					<div>
-						<div class="text-gray-500 text-sm">学生ID</div>
-						<div class="text-base font-medium">{{ detail?.studentId ?? '-' }}</div>
+						<div class="text-gray-500 text-sm">学生</div>
+						<div class="text-base font-medium">
+							{{ studentDetail?.name ?? '-' }}
+						</div>
+						<div class="text-gray-500 text-xs mt-1">
+							班级：{{ studentDetail?.className ?? '-' }}　年级：{{ studentDetail?.gradeName ?? '-' }}
+						</div>
 					</div>
 					<div>
 						<div class="text-gray-500 text-sm">试题ID</div>
@@ -76,6 +81,7 @@
 <script setup>
 import { ref, computed, watch } from 'vue'
 import { getExamWordsDetailResult } from '@/api/exam'
+import { getStudentDetail } from '@/api/student'
 import { getWordsListByIds } from '@/api/words'
 
 const props = defineProps({
@@ -94,6 +100,7 @@ const detail = ref(null)
 const activeNames = ref(['correct', 'wrong'])
 const correctTitles = ref([])
 const wrongTitles = ref([])
+const studentDetail = ref(null)
 
 async function fetchDetail() {
 	if (!props.id && props.id !== 0) return
@@ -103,6 +110,7 @@ async function fetchDetail() {
 		const d = res?.data?.data ?? null
 		detail.value = d
 		await fetchTitles()
+		await fetchStudent()
 	} finally {
 		loading.value = false
 	}
@@ -133,6 +141,14 @@ async function fetchTitles() {
 	}
 }
 
+async function fetchStudent() {
+	studentDetail.value = null
+	const sid = detail.value?.studentId
+	if (!sid && sid !== 0) return
+	const res = await getStudentDetail(Number(sid))
+	studentDetail.value = res?.data?.data ?? null
+}
+
 watch(
 	() => props.modelValue,
 	(v) => {