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-simple-svg-generation.php

@@ -0,0 +1,98 @@
+<?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;
+use App\Framework\QrCode\ValueObjects\QrCodeStyle;
+
+echo "=== Simple SVG Generation Test ===\n\n";
+
+$config = new QrCodeConfig(
+    version: QrCodeVersion::fromNumber(1),
+    errorCorrectionLevel: ErrorCorrectionLevel::M,
+    encodingMode: EncodingMode::BYTE
+);
+
+$matrix = QrCodeGenerator::generate('HELLO', $config);
+$size = $matrix->getSize();
+
+echo "Matrix: {$size}x{$size}\n\n";
+
+// Generate SVG manually to ensure correct structure
+$moduleSize = 20;
+$quietZone = 80;
+$canvasSize = $size * $moduleSize + 2 * $quietZone;
+
+$svg = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
+$svg .= "<svg width=\"{$canvasSize}\" height=\"{$canvasSize}\" xmlns=\"http://www.w3.org/2000/svg\">\n";
+$svg .= "  <title>QR Code</title>\n";
+$svg .= "  <desc>QR Code Version 1</desc>\n";
+$svg .= "  <rect x=\"0\" y=\"0\" width=\"{$canvasSize}\" height=\"{$canvasSize}\" fill=\"white\" />\n";
+
+// Render all dark modules
+for ($row = 0; $row < $size; $row++) {
+    for ($col = 0; $col < $size; $col++) {
+        if ($matrix->getModuleAt($row, $col)->isDark()) {
+            $x = $quietZone + $col * $moduleSize;
+            $y = $quietZone + $row * $moduleSize;
+            $svg .= "  <rect x=\"{$x}\" y=\"{$y}\" width=\"{$moduleSize}\" height=\"{$moduleSize}\" fill=\"black\" />\n";
+        }
+    }
+}
+
+$svg .= "</svg>\n";
+
+// Save
+$filepath = __DIR__ . '/test-qrcodes/simple-manual.svg';
+file_put_contents($filepath, $svg);
+
+echo "✅ Generated simple manual SVG: {$filepath}\n";
+echo "   Canvas: {$canvasSize}x{$canvasSize}\n";
+echo "   Module size: {$moduleSize}px\n";
+echo "   Quiet zone: {$quietZone}px\n\n";
+
+// Compare with renderer output
+$style = QrCodeStyle::large();
+$renderer = new QrCodeRenderer();
+$rendererSvg = $renderer->renderCustom($matrix, $style, false);
+
+$rendererPath = __DIR__ . '/test-qrcodes/renderer-output.svg';
+file_put_contents($rendererPath, $rendererSvg);
+
+echo "✅ Generated renderer SVG: {$rendererPath}\n\n";
+
+// Compare structure
+echo "=== Structure Comparison ===\n";
+
+// Count rectangles
+$manualRects = substr_count($svg, '<rect');
+$rendererRects = substr_count($rendererSvg, '<rect');
+
+echo "Manual SVG rectangles: {$manualRects}\n";
+echo "Renderer SVG rectangles: {$rendererRects}\n";
+
+// Check if renderer uses viewBox or other attributes
+if (strpos($rendererSvg, 'viewBox') !== false) {
+    echo "Renderer SVG uses viewBox\n";
+}
+
+// Check coordinate format
+if (preg_match('/<rect x="(\d+\.?\d*)" y="(\d+\.?\d*)" width="(\d+\.?\d*)" height="(\d+\.?\d*)" fill="black"/', $rendererSvg, $matches)) {
+    echo "Renderer coordinate format: x={$matches[1]}, y={$matches[2]}, w={$matches[3]}, h={$matches[4]}\n";
+}
+
+if (preg_match('/<rect x="(\d+\.?\d*)" y="(\d+\.?\d*)" width="(\d+\.?\d*)" height="(\d+\.?\d*)" fill="black"/', $svg, $matches)) {
+    echo "Manual coordinate format: x={$matches[1]}, y={$matches[2]}, w={$matches[3]}, h={$matches[4]}\n";
+}
+
+echo "\n";
+echo "Try scanning both SVG files to see if one works better.\n";
+
+