feat(infra) : add monolog logging and persist logs in prod

Install symfony/monolog-bundle with rotating_file handlers.
Add named volume inventory_logs for prod log persistence.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

infra/prod/docker-compose.yml

@@ -7,6 +7,10 @@ services:
       - "8082:80"
     volumes:
       - ./storage:/var/www/html/var/storage/documents
+      - inventory_logs:/var/www/html/var/log
     extra_hosts:
       - "host.docker.internal:host-gateway"
     restart: unless-stopped
+
+volumes:
+  inventory_logs: