Docker: agregar setup local con NGINX + PHP-FPM y script de control

Incluye Dockerfile, docker-compose.yml (puerto 8088), nginx.conf y
script _app con --status, --start y --stop para levantar la app localmente.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker/nginx.conf

@@ -0,0 +1,23 @@
+server {
+    listen 80;
+    root /var/www/html;
+    index index.html index.php;
+
+    resolver 127.0.0.11 valid=10s;
+
+    location / {
+        try_files $uri $uri/ =404;
+    }
+
+    location ~ \.php$ {
+        set $upstream app:9000;
+        fastcgi_pass $upstream;
+        fastcgi_index index.php;
+        include fastcgi_params;
+        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+    }
+
+    location ~ /db/ {
+        deny all;
+    }
+}