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/TimetableView.vue

@@ -5,6 +5,7 @@ import { useRoute } from 'vue-router'
 import http, { apiErrorMessage } from '../api/http'
 import { downloadApiFile } from '../api/excel'
 import { useAuthStore } from '../stores/auth'
+import { academicTermLabel, academicTermOptionClass, defaultAcademicTermId } from '../utils/academicTerms'
 
 const route = useRoute()
 const auth = useAuthStore()
@@ -297,9 +298,8 @@ async function loadPublicOptions() {
   colleges.value = data.colleges
   majors.value = data.majors
   classes.value = data.classes
-  termId.value = data.terms.find((item: any) => item.isCurrent)?.id
+  termId.value = defaultAcademicTermId(data.terms)
     ?? data.terms.find((item: any) => item.hasPublishedTimetable)?.id
-    ?? data.terms[0]?.id
     ?? ''
   const initialClass = data.classes.find((item: any) => item.hasPublishedTimetable)
     ?? data.classes[0]
@@ -502,9 +502,7 @@ onMounted(async () => {
     if (isTeacherView.value) {
       const { data } = await http.get('/timetables/options')
       terms.value = data.terms
-      termId.value = data.terms.find((item: any) => item.isCurrent)?.id
-        ?? data.terms[0]?.id
-        ?? ''
+      termId.value = defaultAcademicTermId(data.terms) ?? ''
       await loadTimetable()
       return
     }
@@ -539,8 +537,9 @@ onMounted(async () => {
           <el-option
             v-for="term in terms"
             :key="term.id"
-            :label="`${term.name}${!isManager && !term.hasPublishedTimetable ? '（未发布）' : ''}`"
+            :label="`${academicTermLabel(term)}${!isManager && !term.hasPublishedTimetable ? '（未发布）' : ''}`"
             :value="term.id"
+            :class="academicTermOptionClass(term)"
           />
         </el-select>
         <el-select v-if="isManager" v-model="planId" placeholder="选择课表版本">