Replace docker-compose with docker compose

Use modern docker compose command instead of deprecated docker-compose

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

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

lib/mosquitto-sync.ts

@@ -172,7 +172,7 @@ async function reloadMosquitto(): Promise<boolean> {
     return true;
   } catch (error) {
     console.log('⚠ Could not reload Mosquitto automatically (requires docker socket permissions)');
-    console.log('→ Changes saved to config files - restart Mosquitto to apply: docker-compose restart mosquitto');
+    console.log('→ Changes saved to config files - restart Mosquitto to apply: docker compose restart mosquitto');
     // Werfe keinen Fehler - Config-Dateien sind aktualisiert, werden beim nächsten Restart geladen
     return false;
   }