学年学期页面新增“设为当前”“归档”“撤销归档”，当前学期不能归档、删除或直接取消；已归档学期需先撤销才能重新设为当前。[BaseDataController.cs (line 286)](/E:/jiaowu/src/Jiaowu.Api/Controllers/BaseDataController.cs:286)

切换后，其他学期自动变为历史态；已归档学期进一步弱化。所有主要学期选择器统一默认当前，并显示“当前 / 历史 / 已归档”。[academicTerms.ts (line 1)](/E:/jiaowu/web/src/utils/academicTerms.ts:1)
桌面使用分层表格，390px 手机端改为独立学期卡片，操作不会再挤压表格。[BaseDataView.vue (line 211)](/E:/jiaowu/web/src/views/BaseDataView.vue:211)
归档定义为“历史显示状态”，不是成绩冻结：补考成绩仍可录入并回写，已发布成绩仍可走成绩更正审批。
已加入 SQLite 开发迁移、MySQL 正式迁移和切换/归档/撤销测试。[20260726143000_AcademicTermArchiving.cs (line 1)](/E:/jiaowu/src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/20260726143000_AcademicTermArchiving.cs:1)

web/src/views/StatisticsView.vue

@@ -7,6 +7,7 @@ import { GridComponent, LegendComponent, TitleComponent, TooltipComponent } from
 import { CanvasRenderer } from 'echarts/renderers'
 import { downloadApiFile } from '../api/excel'
 import http from '../api/http'
+import { academicTermLabel, academicTermOptionClass, defaultAcademicTermId } from '../utils/academicTerms'
 
 echarts.use([BarChart, LineChart, PieChart, TitleComponent, TooltipComponent, LegendComponent, GridComponent, CanvasRenderer])
 
@@ -367,10 +368,7 @@ onMounted(async () => {
   courseCategories.value = catRes.data
   classroomBuildings.value = bRes.data
   classroomCampuses.value = campRes.data
-  if (terms.value.length > 0) {
-    const cur = terms.value.find((t: any) => t.isCurrent) ?? terms.value[terms.value.length - 1]
-    globalTermId.value = cur.id
-  }
+  globalTermId.value = defaultAcademicTermId(terms.value) ?? ''
   loadStudentStats()
 })
 </script>
@@ -385,7 +383,7 @@ onMounted(async () => {
       </div>
       <div class="page-actions">
         <el-select v-model="globalTermId" placeholder="选择学期" style="width:220px" clearable @change="() => { loadStudentStats(); loadGradeStats(); loadPassRateStats(); loadWorkloadStats(); loadClassroomStats() }">
-          <el-option v-for="t in terms" :key="t.id" :label="t.name" :value="t.id" />
+          <el-option v-for="t in terms" :key="t.id" :label="academicTermLabel(t)" :value="t.id" :class="academicTermOptionClass(t)" />
         </el-select>
       </div>
     </section>