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-bit-by-bit.php

@@ -0,0 +1,107 @@
+<?php
+
+declare(strict_types=1);
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+echo "=== Bit-by-Bit Encoding Comparison ===\n\n";
+
+$testData = 'HELLO WORLD';
+$dataLength = strlen($testData);
+
+// Build our bit string
+$bits = '';
+
+// 1. Mode indicator (4 bits) - Byte mode = 0100
+$bits .= '0100';
+
+// 2. Character count (8 bits for version 1-9)
+$bits .= str_pad(decbin($dataLength), 8, '0', STR_PAD_LEFT);
+
+// 3. Data bytes
+for ($i = 0; $i < $dataLength; $i++) {
+    $byte = ord($testData[$i]);
+    $bits .= str_pad(decbin($byte), 8, '0', STR_PAD_LEFT);
+}
+
+echo "Bits after mode + count + data: " . strlen($bits) . "\n";
+echo "First 60 bits: " . substr($bits, 0, 60) . "...\n\n";
+
+// 4. Terminator
+$requiredBits = 16 * 8; // 128 bits for version 1, level M
+$terminatorLength = min(4, max(0, $requiredBits - strlen($bits)));
+$bits .= str_repeat('0', $terminatorLength);
+echo "After terminator ({$terminatorLength} bits): " . strlen($bits) . " bits\n\n";
+
+// 5. Pad to multiple of 8
+$remainder = strlen($bits) % 8;
+if ($remainder !== 0) {
+    $bits .= str_repeat('0', 8 - $remainder);
+}
+echo "After padding to byte: " . strlen($bits) . " bits\n\n";
+
+// 6. Add pad codewords
+$padBytes = ['11101100', '00010001'];
+$padIndex = 0;
+$padBits = '';
+while (strlen($bits) < $requiredBits) {
+    $padBits .= $padBytes[$padIndex % 2];
+    $bits .= $padBytes[$padIndex % 2];
+    $padIndex++;
+}
+echo "Pad codewords added: {$padIndex}\n";
+echo "Pad bits: {$padBits}\n\n";
+
+// 7. Convert to codewords
+$codewords = [];
+for ($i = 0; $i < strlen($bits); $i += 8) {
+    $byte = substr($bits, $i, 8);
+    $codewords[] = bindec($byte);
+}
+
+echo "Generated codewords:\n";
+echo implode(', ', $codewords) . "\n\n";
+
+// Expected codewords
+$expected = [64, 180, 132, 84, 196, 196, 242, 5, 116, 245, 174, 59, 64, 109, 236, 233];
+echo "Expected codewords:\n";
+echo implode(', ', $expected) . "\n\n";
+
+// Compare bit strings
+$expectedBits = '';
+foreach ($expected as $codeword) {
+    $expectedBits .= str_pad(decbin($codeword), 8, '0', STR_PAD_LEFT);
+}
+
+echo "=== Bit String Comparison ===\n";
+echo "Our bit string length: " . strlen($bits) . "\n";
+echo "Expected bit string length: " . strlen($expectedBits) . "\n\n";
+
+// Find first difference
+$minLength = min(strlen($bits), strlen($expectedBits));
+for ($i = 0; $i < $minLength; $i++) {
+    if ($bits[$i] !== $expectedBits[$i]) {
+        $codewordIndex = intval($i / 8);
+        $bitInCodeword = $i % 8;
+        echo "❌ First difference at bit {$i} (codeword {$codewordIndex}, bit {$bitInCodeword})\n";
+        echo "   Our bit: {$bits[$i]}\n";
+        echo "   Expected: {$expectedBits[$i]}\n";
+        echo "   Codeword {$codewordIndex}: ours={$codewords[$codewordIndex]}, expected={$expected[$codewordIndex]}\n";
+        echo "   Our bits: " . substr($bits, $codewordIndex * 8, 8) . "\n";
+        echo "   Expected: " . substr($expectedBits, $codewordIndex * 8, 8) . "\n";
+        break;
+    }
+}
+
+// Show codeword 10 in detail
+echo "\n=== Codeword 10 Detail ===\n";
+$codeword10Offset = 10 * 8;
+echo "Our bits (80-87): " . substr($bits, $codeword10Offset, 8) . " = " . $codewords[10] . "\n";
+echo "Expected bits:     " . substr($expectedBits, $codeword10Offset, 8) . " = " . $expected[10] . "\n";
+
+// Show surrounding context
+echo "\nContext (bits 72-95, codewords 9-11):\n";
+echo "Our:      " . substr($bits, 72, 24) . "\n";
+echo "Expected: " . substr($expectedBits, 72, 24) . "\n";
+
+