fix: auto-scroll terminal animation to bottom as new lines appear

Author: AI Assistant

index.html

@@ -485,7 +485,8 @@ <h2 data-i18n="ctaTitle">告别手动安装，从现在开始</h2>
     div.className = 'term-line';
     div.innerHTML = line.html;
     body.insertBefore(div, cursor);
-    requestAnimationFrame(() => div.classList.add('visible'));
+    requestAnimationFrame(() => { div.classList.add('visible'); });
+    setTimeout(() => { body.scrollTop = body.scrollHeight; }, 50);
     lineIdx++;
     if (line.delay > 0) setTimeout(showLine, line.delay);
     else showLine();