已完成教学任务归档纠错功能：

已归档任务新增“撤销归档”和“删除”，支持单条及批量操作。
撤销后恢复为“已发布”状态。
已发布任务仍不可直接删除；被排课、选课、成绩或考试引用的归档任务也会拒绝删除并明确提示。
状态与操作文案统一为“归档”

web/src/views/TeachingTasksView.vue

@@ -56,7 +56,7 @@ const manualEligibleTeachers = ref<any[]>([])
 const statusLabels: Record<string, string> = {
   Draft: '草稿',
   Published: '已发布',
-  Closed: '已结课',
+  Closed: '已归档',
 }
 const courseNatureLabels: Record<string, string> = {
   GeneralRequired: '公共必修',
@@ -166,6 +166,9 @@ const selectedDraftRows = computed(() =>
 const selectedPublishedRows = computed(() =>
   selectedRows.value.filter((item) => item.status === 'Published'),
 )
+const selectedClosedRows = computed(() =>
+  selectedRows.value.filter((item) => item.status === 'Closed'),
+)
 const responsibilityText = computed(() => {
   if (isSuperAdmin.value) return '超级管理员可处理全部教学任务，并保留跨层级纠错权限。'
   if (isAcademicAdmin.value && isCollegeAdmin.value) {
@@ -242,7 +245,7 @@ function clearFilteredClasses(target: Record<string, any>, filtered: any[]) {
 }
 
 function rowSelectable(row: any) {
-  return canManageRow(row) && ['Draft', 'Published'].includes(row.status)
+  return canManageRow(row) && ['Draft', 'Published', 'Closed'].includes(row.status)
 }
 
 function onTaskSelectionChanged(selection: any[]) {
@@ -368,11 +371,21 @@ async function save() {
 }
 
 async function remove(row: any) {
+  const isArchived = row.status === 'Closed'
   try {
-    await ElMessageBox.confirm(`确定删除教学任务“${row.name}”吗？`, '删除草稿', {
-      type: 'warning',
-    })
+    await ElMessageBox.confirm(
+      isArchived
+        ? `将永久删除已归档教学任务“${row.name}”。如任务已被排课、选课、成绩或考试引用，系统会拒绝删除。确定继续吗？`
+        : `确定删除教学任务草稿“${row.name}”吗？`,
+      isArchived ? '删除已归档任务' : '删除草稿',
+      {
+        type: 'error',
+        confirmButtonText: '确认删除',
+        cancelButtonText: '取消',
+      },
+    )
     await http.delete(`/teaching-tasks/${row.id}`)
+    ElMessage.success(isArchived ? '已归档教学任务已删除' : '教学任务草稿已删除')
     await load()
   } catch (error: any) {
     if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
@@ -396,12 +409,32 @@ async function publish(row: any) {
 
 async function closeTask(row: any) {
   try {
-    await ElMessageBox.confirm('结课后将停止后续选课和排课调整，确定继续吗？', '教学任务结课', {
+    await ElMessageBox.confirm('归档后将停止后续选课和排课调整，确定继续吗？', '归档教学任务', {
       type: 'warning',
-      confirmButtonText: '确认结课',
+      confirmButtonText: '确认归档',
       cancelButtonText: '取消',
     })
     await http.post(`/teaching-tasks/${row.id}/close`)
+    ElMessage.success('教学任务已归档')
+    await load()
+  } catch (error: any) {
+    if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
+  }
+}
+
+async function unarchive(row: any) {
+  try {
+    await ElMessageBox.confirm(
+      '撤销归档后，教学任务将恢复为已发布状态，并重新进入相关业务流程。确定继续吗？',
+      '撤销教学任务归档',
+      {
+        type: 'warning',
+        confirmButtonText: '撤销归档',
+        cancelButtonText: '取消',
+      },
+    )
+    await http.post(`/teaching-tasks/${row.id}/unarchive`)
+    ElMessage.success('教学任务已撤销归档')
     await load()
   } catch (error: any) {
     if (error !== 'cancel' && error !== 'close') ElMessage.error(apiErrorMessage(error))
@@ -409,10 +442,12 @@ async function closeTask(row: any) {
 }
 
 async function batchAction(
-  operation: 'Publish' | 'Delete' | 'Archive',
+  operation: 'Publish' | 'Delete' | 'Archive' | 'Unarchive',
   targets: any[],
 ) {
   if (!targets.length) return
+  const deletingArchived = operation === 'Delete' &&
+    targets.every((item) => item.status === 'Closed')
   const descriptions = {
     Publish: {
       title: '批量发布教学任务',
@@ -422,10 +457,12 @@ async function batchAction(
       type: 'warning',
     },
     Delete: {
-      title: '批量删除教学任务',
-      message: `将永久删除选中的 ${targets.length} 个草稿，此操作不可撤销。确定继续吗？`,
+      title: deletingArchived ? '批量删除已归档任务' : '批量删除教学任务草稿',
+      message: deletingArchived
+        ? `将永久删除选中的 ${targets.length} 个已归档任务。已被后续业务引用的任务会拒绝删除，此操作不可撤销。确定继续吗？`
+        : `将永久删除选中的 ${targets.length} 个草稿，此操作不可撤销。确定继续吗？`,
       confirmButtonText: '批量删除',
-      success: '教学任务草稿已批量删除',
+      success: deletingArchived ? '已归档教学任务已批量删除' : '教学任务草稿已批量删除',
       type: 'error',
     },
     Archive: {
@@ -435,6 +472,13 @@ async function batchAction(
       success: '教学任务已批量归档',
       type: 'warning',
     },
+    Unarchive: {
+      title: '批量撤销教学任务归档',
+      message: `将选中的 ${targets.length} 个已归档任务恢复为已发布状态，并重新进入相关业务流程。确定继续吗？`,
+      confirmButtonText: '批量撤销归档',
+      success: '教学任务已批量撤销归档',
+      type: 'warning',
+    },
   } as const
   const description = descriptions[operation]
   try {
@@ -572,7 +616,7 @@ onMounted(async () => {
       <div v-if="selectedRows.length" class="batch-action-bar">
         <div>
           <b>已选择 {{ selectedRows.length }} 个教学任务</b>
-          <span>可操作：{{ selectedDraftRows.length }} 个草稿，{{ selectedPublishedRows.length }} 个已发布</span>
+          <span>可操作：{{ selectedDraftRows.length }} 个草稿，{{ selectedPublishedRows.length }} 个已发布，{{ selectedClosedRows.length }} 个已归档</span>
         </div>
         <div>
           <el-button
@@ -599,6 +643,22 @@ onMounted(async () => {
           >
             归档已发布（{{ selectedPublishedRows.length }}）
           </el-button>
+          <el-button
+            type="primary"
+            plain
+            :disabled="!selectedClosedRows.length"
+            @click="batchAction('Unarchive', selectedClosedRows)"
+          >
+            撤销归档（{{ selectedClosedRows.length }}）
+          </el-button>
+          <el-button
+            type="danger"
+            plain
+            :disabled="!selectedClosedRows.length"
+            @click="batchAction('Delete', selectedClosedRows)"
+          >
+            删除已归档（{{ selectedClosedRows.length }}）
+          </el-button>
         </div>
       </div>
 
@@ -625,14 +685,16 @@ onMounted(async () => {
         <el-table-column label="人数 / 容量" width="105"><template #default="{ row }">{{ row.studentCount }} / {{ row.capacity }}</template></el-table-column>
         <el-table-column label="周次" width="105"><template #default="{ row }">{{ row.startWeek }}—{{ row.endWeek }} 周</template></el-table-column>
         <el-table-column label="状态" width="90"><template #default="{ row }"><span class="table-status" :class="{ off: row.status === 'Closed' }">{{ statusLabels[row.status] }}</span></template></el-table-column>
-        <el-table-column label="操作" width="185" fixed="right">
+        <el-table-column label="操作" width="210" fixed="right">
           <template #default="{ row }">
             <el-button v-if="canManageRow(row) && row.status === 'Draft'" link type="primary" @click="openEdit(row)">编辑</el-button>
             <el-button v-if="canManageRow(row) && row.status === 'Draft'" link type="success" @click="publish(row)">发布</el-button>
             <el-button v-if="canManageRow(row) && row.status === 'Draft'" link type="danger" @click="remove(row)">删除</el-button>
-            <el-button v-if="canManageRow(row) && row.status === 'Published'" link type="warning" @click="closeTask(row)">结课</el-button>
+            <el-button v-if="canManageRow(row) && row.status === 'Published'" link type="warning" @click="closeTask(row)">归档</el-button>
+            <el-button v-if="canManageRow(row) && row.status === 'Closed'" link type="primary" @click="unarchive(row)">撤销归档</el-button>
+            <el-button v-if="canManageRow(row) && row.status === 'Closed'" link type="danger" @click="remove(row)">删除</el-button>
             <span v-if="!canManageRow(row) && row.status !== 'Closed'" class="muted-action">只读</span>
-            <span v-if="row.status === 'Closed'" class="muted-action">已结课归档</span>
+            <span v-if="!canManageRow(row) && row.status === 'Closed'" class="muted-action">已归档</span>
           </template>
         </el-table-column>
         <template #empty><el-empty description="没有符合条件的教学任务" /></template>