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-finder-patterns.php

@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+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 "=== Finder Pattern Validation ===\n\n";
+
+$config = new QrCodeConfig(
+    version: QrCodeVersion::fromNumber(1),
+    errorCorrectionLevel: ErrorCorrectionLevel::M,
+    encodingMode: EncodingMode::BYTE
+);
+
+$matrix = QrCodeGenerator::generate('HELLO', $config);
+$size = $matrix->getSize();
+
+echo "Matrix size: {$size}x{$size}\n\n";
+
+// Expected finder pattern (7x7)
+// 1 1 1 1 1 1 1
+// 1 0 0 0 0 0 1
+// 1 0 1 1 1 0 1
+// 1 0 1 1 1 0 1
+// 1 0 1 1 1 0 1
+// 1 0 0 0 0 0 1
+// 1 1 1 1 1 1 1
+
+$expectedFinder = [
+    [1, 1, 1, 1, 1, 1, 1],
+    [1, 0, 0, 0, 0, 0, 1],
+    [1, 0, 1, 1, 1, 0, 1],
+    [1, 0, 1, 1, 1, 0, 1],
+    [1, 0, 1, 1, 1, 0, 1],
+    [1, 0, 0, 0, 0, 0, 1],
+    [1, 1, 1, 1, 1, 1, 1],
+];
+
+$finderPositions = [
+    ['name' => 'Top-Left', 'row' => 0, 'col' => 0],
+    ['name' => 'Top-Right', 'row' => 0, 'col' => $size - 7],
+    ['name' => 'Bottom-Left', 'row' => $size - 7, 'col' => 0],
+];
+
+foreach ($finderPositions as $finder) {
+    echo "=== {$finder['name']} Finder Pattern ===\n";
+    $errors = 0;
+    
+    for ($r = 0; $r < 7; $r++) {
+        $row = $finder['row'] + $r;
+        $bits = '';
+        $expectedBits = '';
+        
+        for ($c = 0; $c < 7; $c++) {
+            $col = $finder['col'] + $c;
+            $isDark = $matrix->getModuleAt($row, $col)->isDark();
+            $expectedDark = $expectedFinder[$r][$c] === 1;
+            
+            $bits .= $isDark ? '1' : '0';
+            $expectedBits .= $expectedDark ? '1' : '0';
+            
+            if ($isDark !== $expectedDark) {
+                $errors++;
+            }
+        }
+        
+        echo "Row {$r}: {$bits} (expected: {$expectedBits})";
+        if ($bits === $expectedBits) {
+            echo " ✅\n";
+        } else {
+            echo " ❌\n";
+        }
+    }
+    
+    if ($errors === 0) {
+        echo "✅ {$finder['name']} finder pattern is CORRECT\n\n";
+    } else {
+        echo "❌ {$finder['name']} finder pattern has {$errors} errors\n\n";
+    }
+}
+
+