This PR includes two changes:

1. StorageClass per app

• Allows selecting local-path or longhorn per app in the UI
• Default stays longhorn
• Prevents DBs from failing on VPS setups where Longhorn block storage is unreliable

2. Client IP propagation via UI

• Adds a UI toggle to enable Traefik externalTrafficPolicy: Local
• Automatically patches the Traefik Service and restarts the deployment
• Removes the need for manual kubectl edit steps

A comment on 2: I wanted to obtain the IP address of users that visited my website from inside an app and to achieve this, I had to perform the underneath steps which now should be integrated into QuickStack and be persisted:

kubectl edit svc traefik -n kube-system
kubectl rollout restart deployment traefik -n kube-system
kubectl get pods -n kube-system -w | grep traefik
-> set externalTrafficPolicy: Local