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-qrcode-validation.php

@@ -0,0 +1,77 @@
+<?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;
+
+// Test simple URL
+$testUrl = 'https://localhost/';
+
+echo "Testing QR Code generation for: {$testUrl}\n\n";
+
+try {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    
+    // Generate matrix
+    $matrix = \App\Framework\QrCode\QrCodeGenerator::generate($testUrl);
+    
+    echo "Matrix generated successfully\n";
+    echo "Version: " . $matrix->getVersion()->getVersionNumber() . "\n";
+    echo "Size: " . $matrix->getSize() . "x" . $matrix->getSize() . "\n";
+    echo "Dark modules: " . $matrix->countDarkModules() . "\n\n";
+    
+    // Generate SVG
+    $svg = $generator->generateSvg($testUrl);
+    echo "SVG length: " . strlen($svg) . " characters\n";
+    
+    // Generate Data URI
+    $dataUri = $generator->generateDataUri($testUrl);
+    echo "Data URI length: " . strlen($dataUri) . " characters\n";
+    echo "Data URI prefix: " . substr($dataUri, 0, 50) . "...\n\n";
+    
+    // Check matrix structure
+    echo "Checking matrix structure:\n";
+    $size = $matrix->getSize();
+    
+    // Check finder patterns
+    $topLeft = $matrix->getModuleAt(0, 0)->isDark();
+    $topRight = $matrix->getModuleAt(0, $size - 1)->isDark();
+    $bottomLeft = $matrix->getModuleAt($size - 1, 0)->isDark();
+    
+    echo "Top-left finder (0,0): " . ($topLeft ? "dark" : "light") . "\n";
+    echo "Top-right finder (0," . ($size - 1) . "): " . ($topRight ? "dark" : "light") . "\n";
+    echo "Bottom-left finder (" . ($size - 1) . ",0): " . ($bottomLeft ? "dark" : "light") . "\n";
+    
+    // Check format information row
+    echo "\nFormat information row (row 8):\n";
+    for ($col = 0; $col < min(15, $size); $col++) {
+        $module = $matrix->getModuleAt(8, $col);
+        echo $module->isDark() ? '█' : '░';
+    }
+    echo "\n";
+    
+    // Check format information column
+    echo "Format information column (col 8, bottom 7):\n";
+    for ($row = $size - 7; $row < $size; $row++) {
+        $module = $matrix->getModuleAt($row, 8);
+        echo $module->isDark() ? '█' : '░';
+    }
+    echo "\n";
+    
+    // Save SVG to file for manual inspection
+    $svgFile = __DIR__ . '/qrcode-test.svg';
+    file_put_contents($svgFile, $svg);
+    echo "\nSVG saved to: {$svgFile}\n";
+    echo "You can open this file in a browser or QR code scanner to test.\n";
+    
+} catch (\Exception $e) {
+    echo "ERROR: " . $e->getMessage() . "\n";
+    echo "Trace:\n" . $e->getTraceAsString() . "\n";
+}
+
+