refactor(deployment): Remove WireGuard VPN dependency and restore public service access

Remove WireGuard integration from production deployment to simplify infrastructure:
- Remove docker-compose-direct-access.yml (VPN-bound services)
- Remove VPN-only middlewares from Grafana, Prometheus, Portainer
- Remove WireGuard middleware definitions from Traefik
- Remove WireGuard IPs (10.8.0.0/24) from Traefik forwarded headers

All monitoring services now publicly accessible via subdomains:
- grafana.michaelschiemer.de (with Grafana native auth)
- prometheus.michaelschiemer.de (with Basic Auth)
- portainer.michaelschiemer.de (with Portainer native auth)

All services use Let's Encrypt SSL certificates via Traefik.

tests/debug/test-reed-solomon-ec.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+use App\Framework\QrCode\ErrorCorrection\ReedSolomonEncoder;
+use App\Framework\QrCode\QrCodeGenerator;
+use App\Framework\QrCode\ValueObjects\ErrorCorrectionLevel;
+use App\Framework\QrCode\ValueObjects\QrCodeConfig;
+use App\Framework\QrCode\ValueObjects\QrCodeVersion;
+use App\Framework\QrCode\ValueObjects\EncodingMode;
+
+echo "=== Reed-Solomon Error Correction Test ===\n\n";
+
+// Test with known data
+$testData = 'HELLO WORLD';
+$config = new QrCodeConfig(
+    version: QrCodeVersion::fromNumber(1),
+    errorCorrectionLevel: ErrorCorrectionLevel::M,
+    encodingMode: EncodingMode::BYTE
+);
+
+// Manually encode data
+$encoder = new \ReflectionClass(QrCodeGenerator::class);
+$method = $encoder->getMethod('encodeData');
+$method->setAccessible(true);
+
+$tempGenerator = new QrCodeGenerator(new \App\Framework\QrCode\QrCodeRenderer());
+$dataCodewords = $method->invoke($tempGenerator, $testData, $config);
+
+echo "Data codewords: " . count($dataCodewords) . "\n";
+echo "First 5 data codewords: " . implode(', ', array_slice($dataCodewords, 0, 5)) . "\n\n";
+
+// Generate EC codewords
+$reedSolomon = new ReedSolomonEncoder();
+$ecInfo = ReedSolomonEncoder::getECInfo(1, 'M');
+echo "EC info:\n";
+echo "  Data codewords: {$ecInfo['dataCodewords']}\n";
+echo "  EC codewords: {$ecInfo['ecCodewords']}\n\n";
+
+$ecCodewords = $reedSolomon->encode($dataCodewords, $ecInfo['ecCodewords']);
+
+echo "EC codewords: " . count($ecCodewords) . "\n";
+echo "First 5 EC codewords: " . implode(', ', array_slice($ecCodewords, 0, 5)) . "\n\n";
+
+// Expected for Version 1, Level M:
+// Data: 16 codewords
+// EC: 10 codewords
+// Total: 26 codewords
+
+$allCodewords = array_merge($dataCodewords, $ecCodewords);
+echo "Total codewords: " . count($allCodewords) . " (expected: 26)\n";
+
+if (count($allCodewords) === 26) {
+    echo "✅ Codeword count is correct\n";
+} else {
+    echo "❌ Codeword count is wrong!\n";
+}
+
+// Verify known values for "HELLO WORLD" (if available)
+echo "\n=== Codeword Verification ===\n";
+echo "Note: This is a basic check. Full verification requires reference implementation.\n";
+
+