feat(plan): 支持学案生成时指定单词数

- 在 AddLessonPlanReqVO 中新增 wordSize 字段
- 修改 LessonPlansService 接口及实现，支持 wordSize 参数
- 优化学案生成逻辑，按指定单词数切分词汇列表
- 更新前端 LessonPlanDialog，添加单词数输入框
- 修改生成学案接口及调用，传递 wordSize 参数
- 增加查询学生词汇掌握详情接口及实现
- 添加学生词汇统计展示组件及页面集成
- 调整词汇相关 Mapper，修正记忆强度条件范围
- 更新权限配置，允许访问学生单词详情接口

enlish-vue/src/pages/student.vue

@@ -6,8 +6,7 @@
             </el-header>
 
             <el-main class="p-4">
-                <div class="grid grid-cols-1 lg:grid-cols-1 gap-6"
-                    v-loading="loading">
+                <div class="grid grid-cols-1 lg:grid-cols-2 gap-6" v-loading="loading">
                     <div class="bg-white dark:bg-gray-800 rounded-lg shadow p-6">
                         <div class="text-lg font-semibold mb-4">学生详情</div>
                         <template v-if="detail">
@@ -24,6 +23,20 @@
                         </template>
                     </div>
 
+                    <div class="bg-white dark:bg-gray-800 rounded-lg shadow p-6">
+                        <div class="text-lg font-semibold mb-4">学生词汇统计</div>
+                        <template v-if="wordStat">
+                            <el-descriptions :column="1" border>
+                                <el-descriptions-item label="已掌握">{{ wordStat.masteredWordCount }}</el-descriptions-item>
+                                <el-descriptions-item label="未掌握">{{ wordStat.unmasteredWordCount }}</el-descriptions-item>
+                                <el-descriptions-item label="待复习">{{ wordStat.pendingReviewWordCount }}</el-descriptions-item>
+                            </el-descriptions>
+                        </template>
+                        <template v-else>
+                            <el-empty description="暂无统计" />
+                        </template>
+                    </div>
+
                     <div class="bg-white dark:bg-gray-800 rounded-lg shadow p-6">
                         <div class="text-md font-semibold mb-3">学生考试记录</div>
                         <ExamHistoryChart :data="history" />
@@ -63,6 +76,7 @@ import { ref, onMounted, computed } from 'vue'
 import { useRoute } from 'vue-router'
 import { getStudentDetail, getStudentStudyAnalyze } from '@/api/student'
 import { getStudentExamHistory } from '@/api/exam'
+import { getWordStudentDetail } from '@/api/words'
 import ExamHistoryChart from '@/layouts/components/student/ExamHistoryChart.vue'
 import PlanHistoryChart from '@/layouts/components/student/PlanHistoryChart.vue'
 import WordMasteryHeatmap from '@/layouts/components/student/WordMasteryHeatmap.vue'
@@ -74,6 +88,7 @@ const route = useRoute()
 const history = ref([])
 const analyzeLoading = ref(false)
 const analysisText = ref('')
+const wordStat = ref(null)
 const md = new MarkdownIt({
     html: false,
     linkify: true,
@@ -122,8 +137,17 @@ async function fetchStudyAnalyze() {
     }
 }
 
+async function fetchWordStat() {
+    const id = route.params.id
+    if (!id) return
+    const res = await getWordStudentDetail(Number(id))
+    const d = res.data
+    wordStat.value = d?.data || null
+}
+
 onMounted(() => {
     fetchDetail()
     fetchExamHistory()
+    fetchWordStat()
 })
 </script>