docs: add DartNode sponsorship section to README

Author: JoeanAmier

README.md

@@ -394,6 +394,12 @@ A: 由于权限限制，您无法直接触发主仓库的 Actions。请通过 Fo
 
 ***
 
+## DartNode
+
+[![Powered by DartNode](https://dartnode.com/branding/DN-Open-Source-sm.png)](https://dartnode.com "Powered by DartNode - Free VPS for Open Source")
+
+***
+
 ## TikHub
 
 <p><a href="https://tikhub.io/">TikHub</a>：第三方 API 服务供应商，专注于提供各平台 API。</p>

README_EN.md

@@ -404,6 +404,12 @@ repository to execute the build process
 
 ***
 
+## DartNode
+
+[![Powered by DartNode](https://dartnode.com/branding/DN-Open-Source-sm.png)](https://dartnode.com "Powered by DartNode - Free VPS for Open Source")
+
+***
+
 ## TikHub
 
 <p><a href="https://tikhub.io/">TikHub</a>: Third-party API provider offering multi-platform APIs.</p>