feat: enhance Apache config for Traefik reverse proxy

- Add RemoteIP configuration to capture real client IPs
- Enable HTTPS detection via X-Forwarded-Proto header
- Add security headers (X-Frame-Options, CSP, etc.)
- Disable Apache WebDAV to prevent conflicts with Nextcloud
- Add module activation script for remoteip and env
- Optimize Directory options (FollowSymLinks without MultiViews)
- Add commented alternative PHP limits for reference

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -28,6 +28,10 @@ services:
       - PHP_POST_MAX_SIZE=2G
       - PHP_MAX_EXECUTION_TIME=1800
       - PHP_MAX_INPUT_TIME=1800
+      # - PHP_UPLOAD_MAX_FILESIZE=1024G
+      # - PHP_POST_MAX_SIZE=1024G
+      # - PHP_MAX_EXECUTION_TIME=86400
+      # - PHP_MAX_INPUT_TIME=86400
       # Apache
       - APACHE_BODY_LIMIT=2147483648
     healthcheck: