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/TeachingTasksView.vue

@@ -3,6 +3,7 @@ import { computed, onMounted, reactive, ref } from 'vue'
 import { Plus, Refresh, Search } from '@element-plus/icons-vue'
 import http, { apiErrorMessage } from '../api/http'
 import { useAuthStore } from '../stores/auth'
+import { academicTermLabel, academicTermOptionClass, defaultAcademicTermId } from '../utils/academicTerms'
 
 const auth = useAuthStore()
 const isSuperAdmin = computed(() => auth.user?.roles.includes('SuperAdmin') ?? false)
@@ -283,11 +284,10 @@ function resetFilters() {
 
 function resetForm(detail?: any) {
   Object.keys(form).forEach((key) => delete form[key])
-  const currentTerm = terms.value.find((item) => item.isCurrent)
   Object.assign(form, {
     taskNumber: '',
     name: '',
-    academicTermId: currentTerm?.id,
+    academicTermId: defaultAcademicTermId(terms.value),
     courseId: undefined,
     capacity: 60,
     startWeek: 1,
@@ -499,9 +499,8 @@ async function batchAction(
 }
 
 function openGeneration() {
-  const currentTerm = terms.value.find((item) => item.isCurrent)
   Object.assign(generationForm, {
-    academicTermId: query.academicTermId ?? currentTerm?.id,
+    academicTermId: query.academicTermId ?? defaultAcademicTermId(terms.value),
     courseId: undefined,
     classesPerTask: 3,
     startWeek: 1,
@@ -576,7 +575,7 @@ onMounted(async () => {
   courses.value = courseRes.data
   classes.value = classRes.data
   majors.value = majorRes.data
-  query.academicTermId = terms.value.find((item) => item.isCurrent)?.id
+  query.academicTermId = defaultAcademicTermId(terms.value)
   await load()
 })
 </script>
@@ -604,7 +603,7 @@ onMounted(async () => {
       <div class="filter-bar">
         <el-input v-model="query.keyword" :prefix-icon="Search" clearable placeholder="搜索任务编号、教学班或课程" @keyup.enter="query.page = 1; load()" />
         <el-select v-model="query.academicTermId" clearable placeholder="全部学期">
-          <el-option v-for="item in terms" :key="item.id" :label="item.name" :value="item.id" />
+          <el-option v-for="item in terms" :key="item.id" :label="academicTermLabel(item)" :value="item.id" :class="academicTermOptionClass(item)" />
         </el-select>
         <el-select v-model="query.status" clearable placeholder="全部状态">
           <el-option v-for="(label, value) in statusLabels" :key="value" :label="label" :value="value" />
@@ -712,7 +711,7 @@ onMounted(async () => {
           <el-form-item label="教学班名称" required><el-input v-model="form.name" /></el-form-item>
         </div>
         <div class="form-grid">
-          <el-form-item label="开课学期" required><el-select v-model="form.academicTermId" @change="loadManualEligibleTeachers"><el-option v-for="item in terms" :key="item.id" :label="item.name" :value="item.id" /></el-select></el-form-item>
+          <el-form-item label="开课学期" required><el-select v-model="form.academicTermId" @change="loadManualEligibleTeachers"><el-option v-for="item in terms" :key="item.id" :label="academicTermLabel(item)" :value="item.id" :class="academicTermOptionClass(item)" /></el-select></el-form-item>
           <el-form-item label="课程" required>
             <el-select v-model="form.courseId" filterable @change="form.teacherIds = []; form.primaryTeacherId = undefined; loadManualEligibleTeachers()">
               <el-option v-for="item in filteredManageableCourses" :key="item.id" :label="`${item.code} · ${item.name}（${item.totalHours} 学时）`" :value="item.id" />
@@ -807,7 +806,7 @@ onMounted(async () => {
         <div class="form-grid">
           <el-form-item label="开课学期" required>
             <el-select v-model="generationForm.academicTermId" @change="loadEligibleTeachers">
-              <el-option v-for="item in terms" :key="item.id" :label="item.name" :value="item.id" />
+              <el-option v-for="item in terms" :key="item.id" :label="academicTermLabel(item)" :value="item.id" :class="academicTermOptionClass(item)" />
             </el-select>
           </el-form-item>
           <el-form-item label="公共课程" required>