fix: refactor notification display logic and add format function

apps/admin/src/components/NotificationBell.tsx

@@ -3,6 +3,7 @@ import { Badge, Popover, Button, List, Typography, Empty } from 'antd';
 import { BellOutlined } from '@ant-design/icons';
 import { useNavigate } from 'react-router-dom';
 import api from '../api';
+import { formatNotificationText, notificationTypeLabels } from '../utils/notification-display';
 
 interface NotificationItem {
   id: number;
@@ -14,18 +15,6 @@ interface NotificationItem {
   createdAt: string;
 }
 
-const typeLabels: Record<string, string> = {
-  bill_generated: '账单',
-  bill_paid: '账单',
-  check_in: '入住',
-  check_out: '退宿',
-  deposit_due: '押金',
-  deposit_refunded: '押金',
-  class_change: '班级',
-  schedule_conflict: '排课',
-  announcement: '公告',
-};
-
 function timeAgo(dateStr: string): string {
   const diff = Date.now() - new Date(dateStr).getTime();
   const mins = Math.floor(diff / 60000);
@@ -163,7 +152,7 @@ const NotificationBell: React.FC = () => {
                     strong={!item.isRead}
                     style={{ fontSize: 14 }}
                   >
-                    [{typeLabels[item.type] || item.type}] {item.title}
+                    [{notificationTypeLabels[item.type] || item.type}] {formatNotificationText(item.title)}
                   </Typography.Text>
                 }
                 description={