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-qr-code-complete.php

@@ -0,0 +1,145 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+use App\Framework\QrCode\QrCodeGenerator;
+use App\Framework\QrCode\QrCodeRenderer;
+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 "=== Complete QR Code Generation Test ===\n\n";
+
+$testData = 'HELLO WORLD';
+$config = new QrCodeConfig(
+    version: QrCodeVersion::fromNumber(1),
+    errorCorrectionLevel: ErrorCorrectionLevel::M,
+    encodingMode: EncodingMode::BYTE
+);
+
+echo "Test data: '{$testData}'\n";
+echo "Version: {$config->version->getVersionNumber()}\n";
+echo "Error Correction Level: {$config->errorCorrectionLevel->value}\n";
+echo "Encoding Mode: {$config->encodingMode->value}\n\n";
+
+// Generate QR code
+$matrix = QrCodeGenerator::generate($testData, $config);
+$size = $matrix->getSize();
+
+echo "✅ QR Code generated successfully\n";
+echo "Matrix size: {$size}x{$size}\n\n";
+
+// Validate structure
+echo "=== Structure Validation ===\n";
+
+// 1. Matrix size
+$expectedSize = 21;
+if ($size === $expectedSize) {
+    echo "✅ Matrix size: {$size}x{$size}\n";
+} else {
+    echo "❌ Matrix size: {$size}x{$size} (expected: {$expectedSize}x{$expectedSize})\n";
+}
+
+// 2. Count modules
+$darkModules = 0;
+$lightModules = 0;
+for ($row = 0; $row < $size; $row++) {
+    for ($col = 0; $col < $size; $col++) {
+        if ($matrix->getModuleAt($row, $col)->isDark()) {
+            $darkModules++;
+        } else {
+            $lightModules++;
+        }
+    }
+}
+echo "Dark modules: {$darkModules}\n";
+echo "Light modules: {$lightModules}\n";
+echo "Total modules: " . ($darkModules + $lightModules) . " (expected: " . ($size * $size) . ")\n";
+
+if (($darkModules + $lightModules) === ($size * $size)) {
+    echo "✅ Module count correct\n";
+} else {
+    echo "❌ Module count incorrect\n";
+}
+
+// 3. Quiet zone (should be at least 4 modules white border)
+// Version 1 has 21x21 modules, so with quiet zone it should be 29x29
+// But we're generating just the matrix without quiet zone
+echo "\nNote: Quiet zone is handled by renderer, not in matrix\n";
+
+// 4. Render to SVG
+echo "\n=== SVG Rendering ===\n";
+$renderer = new QrCodeRenderer();
+$svg = $renderer->renderSvg($matrix);
+
+$svgLength = strlen($svg);
+echo "SVG generated: {$svgLength} bytes\n";
+
+if ($svgLength > 1000) {
+    echo "✅ SVG size reasonable\n";
+} else {
+    echo "⚠️ SVG size seems small\n";
+}
+
+// Check for SVG structure
+if (strpos($svg, '<svg') !== false && strpos($svg, '</svg>') !== false) {
+    echo "✅ SVG structure valid\n";
+} else {
+    echo "❌ SVG structure invalid\n";
+}
+
+// Count rectangles (should be many for a QR code)
+$rectCount = substr_count($svg, '<rect');
+echo "Rectangles in SVG: {$rectCount}\n";
+
+if ($rectCount > 100) {
+    echo "✅ Reasonable number of rectangles\n";
+} else {
+    echo "⚠️ Few rectangles (might be incorrect)\n";
+}
+
+// 5. Generate data URI (if method exists)
+echo "\n=== Data URI Generation ===\n";
+if (method_exists($renderer, 'generateDataUri')) {
+    $dataUri = $renderer->generateDataUri($matrix);
+    $dataUriLength = strlen($dataUri);
+    echo "Data URI generated: {$dataUriLength} bytes\n";
+    echo "Starts with 'data:image/svg+xml': " . (strpos($dataUri, 'data:image/svg+xml') === 0 ? "✅" : "❌") . "\n";
+} else {
+    // Manually create data URI
+    $svg = $renderer->renderSvg($matrix);
+    $dataUri = 'data:image/svg+xml;base64,' . base64_encode($svg);
+    echo "Data URI generated manually: " . strlen($dataUri) . " bytes\n";
+    echo "Starts with 'data:image/svg+xml': " . (strpos($dataUri, 'data:image/svg+xml') === 0 ? "✅" : "❌") . "\n";
+}
+
+// 6. Test with different data
+echo "\n=== Test with Different Data ===\n";
+$testCases = [
+    'A',
+    'HELLO',
+    'TEST123',
+];
+
+foreach ($testCases as $data) {
+    $testMatrix = QrCodeGenerator::generate($data, $config);
+    $testSize = $testMatrix->getSize();
+    
+    if ($testSize === $expectedSize) {
+        echo "✅ '{$data}': {$testSize}x{$testSize}\n";
+    } else {
+        echo "❌ '{$data}': {$testSize}x{$testSize} (expected: {$expectedSize})\n";
+    }
+}
+
+echo "\n=== Summary ===\n";
+echo "QR Code generation: ✅ Working\n";
+echo "Matrix structure: ✅ Valid\n";
+echo "SVG rendering: ✅ Working\n";
+echo "Data URI: ✅ Working\n";
+echo "\nNote: The QR code should be scannable if all checks pass.\n";
+echo "To verify, scan the generated QR code with a mobile phone.\n";
+