chore(about): 更新页脚版权信息显示

- 将页脚中的版权符号从"©"更改为"Copyright ©"
- 保持其他页脚内容和链接不变
- 确保年份动态更新功能继续正常工作

about.html

@@ -318,7 +318,7 @@
     </div>
 
     <footer class="site-footer">
-        <p>&copy; 2018 <span id="currentYear"></span> Honesty. All rights reserved. <a class="icp" href="https://beian.miit.gov.cn/" target="_blank">湘ICP备20014902号</a> Powered By <a href="https://pages.edgeone.ai/" target="_blank"> Tencent EdgeOne </a></p>
+        <p>Copyright &copy; 2018 <span id="currentYear"></span> Honesty. All rights reserved. <a class="icp" href="https://beian.miit.gov.cn/" target="_blank">湘ICP备20014902号</a> Powered By <a href="https://pages.edgeone.ai/" target="_blank"> Tencent EdgeOne </a></p>
         <script>
             document.getElementById("currentYear").textContent = ' - ' + new Date().getFullYear();
         </script>