Fix: serversideup-konform - Port 8080, /etc/entrypoint.d/

Nach Dokumentation recherchiert:
- Kein ENTRYPOINT override (serversideup hat eigenen)
- Scripts nach /etc/entrypoint.d/ mit 755
- Port 8080 statt 80
- Healthcheck auf /healthcheck Endpoint
- USER www-data am Ende (serversideup Standard)

Quelle: serversideup.net/open-source/docker-php/docs

🤖 Generated with Claude Code

docker-compose.yaml

@@ -28,7 +28,7 @@ services:
     networks:
       - internal
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:80/"]
+      test: ["CMD", "curl", "-f", "http://localhost:8080/healthcheck"]
       interval: 30s
       timeout: 10s
       start_period: 60s