<!DOCTYPE html >
<html lang="en" >
<head>
    <title>FeedCraft</title>
    <meta charset="utf-8">
    <!-- 包含 Tailwind CSS -->
    <script src="https://cdn.tailwindcss.com"></script>
    <style>
        /* 居中容器 */
        .container {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
    </style>
    <script>
        function appendPrefix() {
            const siteSelector = document.getElementById("siteSelector"