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-encoding-issue.php

@@ -0,0 +1,125 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+use App\Framework\QrCode\ErrorCorrection\ReedSolomonEncoder;
+use App\Framework\QrCode\ValueObjects\EncodingMode;
+use App\Framework\QrCode\ValueObjects\QrCodeVersion;
+
+echo "=== Encoding Issue Analysis ===\n\n";
+
+$testData = 'HELLO WORLD';
+echo "Test data: '{$testData}'\n";
+echo "Length: " . strlen($testData) . " bytes\n\n";
+
+// Expected codewords from QR code specification
+$expectedCodewords = [64, 180, 132, 84, 196, 196, 242, 5, 116, 245, 174, 59, 64, 109, 236, 233];
+echo "Expected codewords (16):\n";
+echo implode(', ', $expectedCodewords) . "\n\n";
+
+// Step-by-step encoding
+$version = QrCodeVersion::fromNumber(1);
+$encodingMode = EncodingMode::BYTE;
+
+// 1. Mode indicator
+$modeBits = $encodingMode->getModeBits();
+echo "1. Mode indicator: {$modeBits} (4 bits)\n";
+
+// 2. Character count
+$charCountBits = $encodingMode->getCharacterCountBits($version);
+$countBits = str_pad(decbin(strlen($testData)), $charCountBits, '0', STR_PAD_LEFT);
+echo "2. Character count: {$countBits} (8 bits) = " . strlen($testData) . "\n";
+
+// 3. Data bytes
+$dataBits = '';
+for ($i = 0; $i < strlen($testData); $i++) {
+    $byte = ord($testData[$i]);
+    $byteBits = str_pad(decbin($byte), 8, '0', STR_PAD_LEFT);
+    $dataBits .= $byteBits;
+    echo "3.{$i} Data byte '{$testData[$i]}': {$byteBits} = {$byte}\n";
+}
+
+// 4. Build bit string
+$bits = $modeBits . $countBits . $dataBits;
+echo "\nTotal bits: " . strlen($bits) . "\n";
+
+// 5. Get EC info
+$ecInfo = ReedSolomonEncoder::getECInfo(1, 'M');
+$requiredBits = $ecInfo['dataCodewords'] * 8;
+echo "Required bits: {$requiredBits}\n";
+echo "Bits needed: " . ($requiredBits - strlen($bits)) . "\n\n";
+
+// 6. Terminator (up to 4 bits)
+$terminatorLength = min(4, max(0, $requiredBits - strlen($bits)));
+$bits .= str_repeat('0', $terminatorLength);
+echo "After terminator ({$terminatorLength} bits): " . strlen($bits) . " bits\n";
+
+// 7. Pad to multiple of 8
+$remainder = strlen($bits) % 8;
+if ($remainder !== 0) {
+    $bits .= str_repeat('0', 8 - $remainder);
+}
+echo "After padding to 8: " . strlen($bits) . " bits\n";
+
+// 8. Add pad codewords
+$padBytes = ['11101100', '00010001'];
+$padIndex = 0;
+while (strlen($bits) < $requiredBits) {
+    $bits .= $padBytes[$padIndex % 2];
+    $padIndex++;
+}
+echo "After pad codewords ({$padIndex} added): " . strlen($bits) . " bits\n\n";
+
+// 9. Convert to codewords
+$codewords = [];
+for ($i = 0; $i < strlen($bits); $i += 8) {
+    $byte = substr($bits, $i, 8);
+    $codewords[] = bindec($byte);
+}
+
+echo "Generated codewords (16):\n";
+echo implode(', ', $codewords) . "\n\n";
+
+// Compare bit by bit
+echo "=== Bit-by-Bit Comparison ===\n";
+$expectedBits = '';
+foreach ($expectedCodewords as $cw) {
+    $expectedBits .= str_pad(decbin($cw), 8, '0', STR_PAD_LEFT);
+}
+
+echo "Our bits (128):\n";
+echo $bits . "\n\n";
+echo "Expected bits (128):\n";
+echo $expectedBits . "\n\n";
+
+// Find differences
+$differences = [];
+for ($i = 0; $i < 128; $i++) {
+    if ($bits[$i] !== $expectedBits[$i]) {
+        $differences[] = $i;
+    }
+}
+
+if (empty($differences)) {
+    echo "✅ All bits match!\n";
+} else {
+    echo "❌ " . count($differences) . " bits differ at positions: ";
+    echo implode(', ', array_slice($differences, 0, 20));
+    if (count($differences) > 20) {
+        echo " ...";
+    }
+    echo "\n\n";
+    
+    // Show first 10 differences in detail
+    echo "First differences:\n";
+    for ($i = 0; $i < min(10, count($differences)); $i++) {
+        $pos = $differences[$i];
+        $codeword = (int)($pos / 8);
+        $bitInCodeword = $pos % 8;
+        echo "  Bit {$pos} (Codeword {$codeword}, bit {$bitInCodeword}): got '{$bits[$pos]}', expected '{$expectedBits[$pos]}'\n";
+    }
+}
+
+