feat: v2.5.0 - Complete Technology & Security Update

Features:
- PHP 8.4 support (from 8.3)
- WordPress 7.0 (auto-update via WP-CLI)
- Modern TLS 1.3 cipher suites (2026 best practices)
- Fail2Ban security integration (5 jails: SSH, Nginx, WordPress, recidive)
- Auto-update cron job for WordPress (weekly Minor updates)
- Debian 14 Forky support (testing)
- Ubuntu 25.04 support
- Python 3.12 in GitHub Actions

Security:
- Fail2Ban with SSH brute force protection (24h ban)
- WordPress wp-login.php protection (2h ban)
- Nginx bot scanner protection
- Recidive jail for repeat offenders (1 week ban)
- Modern TLS ciphers (AEAD only)
- HSTS 2 years for preload

Documentation:
- docs/autoupdate.md - WordPress auto-update guide
- docs/fail2ban.md - Fail2Ban configuration guide
- docs/troubleshooting.md - Updated with php_version variable

Breaking changes:
- PHP 8.4 is now the default (requires Ubuntu 20.04+ or Debian 11+)

templates/wordpress.nginx.j2

@@ -26,7 +26,7 @@ server {
     # PHP-Dateien verarbeiten
     location ~ \.php$ {
         include snippets/fastcgi-php.conf;
-        fastcgi_pass unix:/var/run/php/php8.3-fpm.sock;
+        fastcgi_pass unix:/var/run/php/php8.4-fpm.sock;
         fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
         include fastcgi_params;
     }