feat(conduct): add restore revoked record functionality and update history view

frontend/assets/js/admin.js

@@ -251,7 +251,7 @@ async function submitAddSubject() {
 
 // 撤销扣分记录
 async function revokeRecord(recordId) {
-    if (!confirm('确定要撤销这条扣分记录吗？')) return;
+    if (!confirm('确定要撤销这条记录吗？撤销后学生分数将恢复。')) return;
     
     const res = await apiPost('/api/admin/conduct/revoke', { record_id: recordId });
     if (res && res.success) {
@@ -262,6 +262,19 @@ async function revokeRecord(recordId) {
     }
 }
 
+// 反撤销（恢复）记录
+async function restoreRecord(recordId) {
+    if (!confirm('确定要反撤销这条记录吗？分数变动将重新生效。')) return;
+    
+    const res = await apiPost('/api/admin/conduct/restore', { record_id: recordId });
+    if (res && res.success) {
+        showToast('反撤销成功');
+        loadHistory(currentHistoryPage);
+    } else {
+        showToast(res?.message || '反撤销失败', 'error');
+    }
+}
+
 // 关闭模态框
 function closeModal(modalId) {
     const modal = document.getElementById(modalId);