Fix: Restore block_frontend functionality bypassed by domain-based maintenance check

[Copilot]

The early-return logic in checkFrontend() only checked domain-based maintenance status, causing the classic block_frontend setting to be completely bypassed. Installations relying on the block_frontend toggle could no longer activate frontend maintenance.

Changes

• Modified checkFrontend() to check both block_frontend config and domainInMaintenance before allowing early return
• Frontend now blocks when either condition is true, rather than only when domain is in maintenance

// Before: block_frontend bypassed
if (!$domainInMaintenance) {
    return;
}

// After: both conditions respected
$blockFrontend = self::getBoolConfig('block_frontend', false);
if (!$blockFrontend && !$domainInMaintenance) {
    return;
}

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[Copilot]

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