Загрузка данных

<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>VPN Manager</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.min.js"></script>
</head>
<body class="bg-gray-100 min-h-screen p-6">
    <!-- LOGIN -->
    <div id="loginBox" class="max-w-md mx-auto bg-white p-6 rounded shadow">
        <h2 class="text-xl font-bold mb-4">Вход в панель</h2>
        <input id="loginUser" placeholder="Логин" class="w-full p-2 mb-2 border rounded">
        <input id="loginPass" type="password" placeholder="Пароль" class="w-full p-2 mb-2 border rounded">
        <input id="loginCode" placeholder="Код Google Authenticator" class="w-full p-2 mb-2 border rounded">
        <button onclick="login()" class="w-full bg-blue-600 text-white p-2 rounded hover:bg-blue-700">Войти</button>
    </div>

    <!-- DASHBOARD -->
    <div id="dashboard" class="hidden max-w-5xl mx-auto bg-white p-6 rounded shadow">
        <div class="flex gap-4 border-b mb-4">
            <button onclick="showTab('create')" class="px-4 py-2 bg-blue-100 rounded">Создать</button>
            <button onclick="showTab('search')" class="px-4 py-2 bg-gray-100 rounded">Поиск / Управление</button>
            <button onclick="showTab('calendar')" class="px-4 py-2 bg-gray-100 rounded">Календарь</button>
        </div>

        <!-- CREATE -->
        <div id="createTab">
            <input id="cName" placeholder="Имя клиента" class="p-2 border rounded w-full mb-2">
            <input id="cComment" placeholder="Комментарий" class="p-2 border rounded w-full mb-2">
            <label>Трафик (GB): <input id="cTraffic" type="number" value="300" class="p-2 border rounded w-20"></label>
            <label>Срок (дней): <input id="cDays" type="number" value="30" class="p-2 border rounded w-20"></label>
            <select id="cInbound" class="p-2 border rounded w-full my-2">
                <option value="vmess-xtls">vmess-xtls</option>
                <option value="vless-vision">vless-vision</option>
                <option value="trojan">trojan</option>
            </select>
            <button onclick="create