fix(footer): 更新隐私声明链接地址

- 将隐私声明链接从 javascript:; 更改为 /system_file/hc_error/404.html
- 修复了隐私声明点击无响应的问题

public/themes/website/1/zh/demo/components/footer.html

@@ -61,7 +61,7 @@
             <div class="site-footer__legal">
                  <a target="_blank" href="{:getMuiLangUrl('/sitemap.html')}">网站地图</a>
 <!--                 <a target="_blank" href="{:getMuiLangUrl('/privacy.html')}">隐私声明</a>-->
-                <a target="_blank" href="javascript:;">隐私声明</a>
+                <a href="javascript:;">隐私声明</a>
             </div>
         </div>
     </div>