备份：PWA配置前的完整版本

包含所有最新开发的功能和修复，作为PWA正确配置前的备份点。

frontend/src/components/ContactManager.tsx

@@ -76,8 +76,8 @@ const ContactManager: React.FC<ContactManagerProps> = ({
       render: (_, record) => (
         <Space direction="vertical" size={2}>
           {record.mobile && <div><PhoneOutlined style={{ marginRight: 4 }} />{record.mobile}</div>}
-          {record.phone && <div style={{ fontSize: '12px', color: '#666' }}>电话: {record.phone}</div>}
-          {record.wechat && <div style={{ fontSize: '12px', color: '#666' }}>微信: {record.wechat}</div>}
+          {record.phone && <div style={{ fontSize: '12px', color: '#666' }}>{t('component.phonePrefix')}{record.phone}</div>}
+          {record.wechat && <div style={{ fontSize: '12px', color: '#666' }}>{t('component.wechatPrefix')}{record.wechat}</div>}
         </Space>
       )
     },
@@ -192,7 +192,7 @@ const ContactManager: React.FC<ContactManagerProps> = ({
             </Form.Item>
           </div>
           <Form.Item name="whatsapp" label="WhatsApp">
-            <Input placeholder="输入WhatsApp号码" />
+            <Input placeholder={t('component.whatsappPlaceholder')} />
           </Form.Item>
           <Form.Item name="is_primary" label={t('contact.primaryContact')} valuePropName="checked">
             <Switch />