Revert "chore: update website links to vercel domain"

This reverts commit a5ac6215be.

website/index.html

@@ -8,7 +8,7 @@
     <meta property="og:title" content="U-Claw 虾盘 - OpenClaw Offline Installer">
     <meta property="og:description" content="Like YuLinMuFeng for AI. Plug in USB, double-click, done. 插上U盘，双击运行，搞定。">
     <meta property="og:type" content="website">
-    <meta property="og:url" content="https://u-claw.vercel.app">
+    <meta property="og:url" content="https://u-claw.org">
     <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🦞</text></svg>">
     <style>
         * { margin: 0; padding: 0; box-sizing: border-box; }
@@ -607,7 +607,7 @@
             </p>
             <p style="font-size: 16px;">
                 <span style="color: var(--text-dim);">Website:</span>
-                <a href="https://u-claw.vercel.app" style="color: var(--accent); text-decoration: none;">u-claw.vercel.app</a>
+                <a href="https://u-claw.org" style="color: var(--accent); text-decoration: none;">u-claw.org</a>
             </p>
         </div>
     </div>