/**
 * 100k-specific: getDataByDomain — queries webid_domain table
 * Returns key 'webid_domain' (not 'domain_info' like 1core)
 * Must be loaded BEFORE 1core to take precedence via function_exists guard
 */
function getDataByDomain(mysqli $mysqli_conn,string $domain): ?array
{
    if ($mysqli_conn->connect_error) {
        error_log("Lỗi kết nối mysqli: " . $mysqli_conn->connect_error);
        die("Không thể kết nối đến cơ sở dữ liệu.");
    }
    try {
        $stmtDomain = $mysqli_conn->prepare("SELECT * FROM `webid_domain` WHERE `webid_domain`.`domain` = ? LIMIT 1");
        if (!$stmtDomain) throw new Exception("Lỗi prepare: " . $mysqli_conn->error);
        $stmtDomain->bind_param("s", $domain);
        $stmtDomain->execute();
        $domainData = $stmtDomain->get_result()->fetch_assoc();
        $stmtDomain->close();
        if (!$domainData) return null;
        return ['webid_domain' => $domainData];
    } catch (Exception $e) {
        error_log("Lỗi DB: " . $e->getMessage());
        die("Lỗi truy vấn dữ liệu.");
    }
}
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