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/Unit/Framework/QrCode/QrCodeGeneratorTest.php

@@ -3,6 +3,7 @@
 declare(strict_types=1);
 
 use App\Framework\QrCode\QrCodeGenerator;
+use App\Framework\QrCode\QrCodeRenderer;
 use App\Framework\QrCode\ValueObjects\EncodingMode;
 use App\Framework\QrCode\ValueObjects\ErrorCorrectionLevel;
 use App\Framework\QrCode\ValueObjects\QrCodeConfig;
@@ -140,3 +141,103 @@ test('supports different data types', function () {
         ->and($matrix3)->toBeInstanceOf(\App\Framework\QrCode\ValueObjects\QrCodeMatrix::class)
         ->and($matrix4)->toBeInstanceOf(\App\Framework\QrCode\ValueObjects\QrCodeMatrix::class);
 });
+
+// Instance method tests
+test('can generate SVG using instance method', function () {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    $data = 'Hello World';
+
+    $svg = $generator->generateSvg($data);
+
+    expect($svg)->toBeString()
+        ->and($svg)->toContain('<svg')
+        ->and($svg)->toContain('</svg>');
+});
+
+test('can generate data URI using instance method', function () {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    $data = 'Hello World';
+
+    $dataUri = $generator->generateDataUri($data);
+
+    expect($dataUri)->toBeString()
+        ->and($dataUri)->toStartWith('data:image/svg+xml;base64,');
+});
+
+test('can analyze data and get recommendations', function () {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    $data = 'Hello World';
+
+    $analysis = $generator->analyzeData($data);
+
+    expect($analysis)->toBeArray()
+        ->and($analysis)->toHaveKey('dataLength')
+        ->and($analysis)->toHaveKey('dataType')
+        ->and($analysis)->toHaveKey('recommendedVersion')
+        ->and($analysis)->toHaveKey('recommendedErrorLevel')
+        ->and($analysis)->toHaveKey('encodingMode')
+        ->and($analysis)->toHaveKey('matrixSize')
+        ->and($analysis)->toHaveKey('capacity')
+        ->and($analysis)->toHaveKey('efficiency')
+        ->and($analysis['dataLength'])->toBe(strlen($data))
+        ->and($analysis['recommendedVersion'])->toBeGreaterThan(0);
+});
+
+test('analyzeData detects URL type', function () {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    $url = 'https://example.com/test';
+
+    $analysis = $generator->analyzeData($url);
+
+    expect($analysis['dataType'])->toBe('url');
+});
+
+test('analyzeData detects TOTP type', function () {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    $totpUri = 'otpauth://totp/TestApp:user@example.com?secret=JBSWY3DPEHPK3PXP';
+
+    $analysis = $generator->analyzeData($totpUri);
+
+    expect($analysis['dataType'])->toBe('totp');
+});
+
+test('can generate TOTP QR code', function () {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    $totpUri = 'otpauth://totp/TestApp:user@example.com?secret=JBSWY3DPEHPK3PXP&issuer=TestApp';
+
+    $svg = $generator->generateTotpQrCode($totpUri);
+
+    expect($svg)->toBeString()
+        ->and($svg)->toContain('<svg')
+        ->and($svg)->toContain('</svg>');
+});
+
+test('generateSvg with explicit version', function () {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    $data = 'Test';
+    $version = QrCodeVersion::fromNumber(2);
+
+    $svg = $generator->generateSvg($data, ErrorCorrectionLevel::M, $version);
+
+    expect($svg)->toBeString()
+        ->and($svg)->toContain('<svg');
+});
+
+test('generateDataUri with explicit version', function () {
+    $renderer = new QrCodeRenderer();
+    $generator = new QrCodeGenerator($renderer);
+    $data = 'Test';
+    $version = QrCodeVersion::fromNumber(3);
+
+    $dataUri = $generator->generateDataUri($data, ErrorCorrectionLevel::M, $version);
+
+    expect($dataUri)->toBeString()
+        ->and($dataUri)->toStartWith('data:image/svg+xml;base64,');
+});