feat(docker): add standalone Docker setup and remove docker-compose

- Replace Laravel Sail docker-compose with a single-container Dockerfile
- Configure nginx and PHP-FPM via supervisor for production-like environment
- Include optimized PHP extensions and Redis support
- Simplify deployment by removing multi-service orchestration

docker/supervisord.conf

@@ -0,0 +1,12 @@
+[supervisord]
+nodaemon=true
+
+[program:php-fpm]
+command=php-fpm
+autostart=true
+autorestart=true
+
+[program:nginx]
+command=nginx -g 'daemon off;'
+autostart=true
+autorestart=true