Update Docker Registry URLs to HTTPS endpoint (registry.michaelschiemer.de)

- Replace git.michaelschiemer.de:5000 (HTTP) with registry.michaelschiemer.de (HTTPS)
- Update all Ansible playbooks and configuration files
- Update CI/CD workflows to use HTTPS registry endpoint
- Update Docker Compose files with new registry URL
- Update documentation and scripts

Benefits:
- Secure HTTPS connection (no insecure registry config needed)
- Consistent use of HTTPS endpoint via Traefik
- Better security practices for production deployment

deployment/CI_CD_STATUS.md

@@ -49,7 +49,7 @@ admin
 
 **REGISTRY_PASSWORD:**
 ```
-<Das Passwort für git.michaelschiemer.de:5000>
+<Das Passwort für registry.michaelschiemer.de>
 ```
 *Zu finden in: `deployment/stacks/registry/auth/htpasswd` oder manuell gesetzt*
 
@@ -260,7 +260,7 @@ https://git.michaelschiemer.de/admin/actions/runners
 - Prüfe `REGISTRY_USER` und `REGISTRY_PASSWORD` Secrets
 - Teste Registry-Login manuell:
   ```bash
-  docker login git.michaelschiemer.de:5000 -u admin -p <password>
+  docker login registry.michaelschiemer.de -u admin -p <password>
   ```
 
 ### SSH-Verbindung fehlschlägt