docs: 更新README中的捐赠图片链接

将本地捐赠图片替换为远程OSS链接，简化图片管理

README.md

@@ -89,6 +89,6 @@ Copyright (c) 2025 菲鸽
 ## 捐赠
 
 <p align='center'>
-<img alt="special sponsor appwrite" src="./screenshots/pay-1.png" height="330" style="display:inline-block; height:330px;">
-<img alt="special sponsor appwrite" src="./screenshots/pay-2.png" height="330" style="display:inline-block; height:330px; margin-left:10px;">
+<img alt="special sponsor appwrite" src="https://oss.laf.run/ukw0y1-site/pay/wepay.png" height="330" style="display:inline-block; height:330px;">
+<img alt="special sponsor appwrite" src="https://oss.laf.run/ukw0y1-site/pay/alipay.jpg" height="330" style="display:inline-block; height:330px; margin-left:10px;">
 </p>