public static function validateUser($user, &$errors)
{
    if (session_status() === PHP_SESSION_NONE) {
        session_start();
    }
    
    // ثبت لاگ
    $logFile = __DIR__ . '/../internal_data/captcha_log.txt';
    $logEntry = sprintf(
        "[%s] IP: %s | Email: %s | Captcha: %s\n",
        date('Y-m-d H:i:s'),
        $_SERVER['REMOTE_ADDR'] ?? 'unknown',
        $user->email ?? 'unknown',
        (isset($_SESSION['captcha_passed']) && $_SESSION['captcha_passed'] === true) ? 'PASSED' : 'FAILED'
    );
    @file_put_contents($logFile, $logEntry, FILE_APPEND);
    
    if (!isset($_SESSION['captcha_passed']) || $_SESSION['captcha_passed'] !== true) {
        $user->user_state = 'moderated';
        return;
    }
    
    unset($_SESSION['captcha_passed']);
}An unexpected error occurred. Please try again later.