fix: add extra_hosts for smtp.ionos.de to asciinema

Force IONOS SMTP server IP (213.165.67.97) in /etc/hosts
to bypass potential DNS resolution issues.

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

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

asciinema/compose.yaml

@@ -5,6 +5,8 @@ services:
     restart: unless-stopped
     networks:
       - compose_network
+    extra_hosts:
+      - "smtp.ionos.de:213.165.67.97"
     volumes:
       - asciinema_data:/var/opt/asciinema
       - ./theme/custom.css:/app/assets/css/custom.css:ro