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/nginx.conf

@@ -0,0 +1,24 @@
+events {}
+
+http {
+    include mime.types;
+    server {
+        listen 80;
+        root /var/www/public;
+        index index.php;
+
+        location / {
+            try_files $uri $uri/ /index.php?$query_string;
+        }
+
+        location ~ \.php$ {
+            fastcgi_pass 127.0.0.1:9000;
+            fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
+            include fastcgi_params;
+        }
+
+        location ~ /\.ht {
+            deny all;
+        }
+    }
+}

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