Use Recreate deployment strategy for components with RWO PVCs

[jensens]

Problem

Deployments with RWO (ReadWriteOnce) PersistentVolumeClaims use the default RollingUpdate strategy. During rollouts, the new pod cannot mount the PVC while the old pod still holds it, causing Multi-Attach errors and pods stuck in ContainerCreating.

Observed during the v0.2.17 rollout: postfix and webmail pods were stuck for 35+ minutes until the old pods were manually deleted.

Affected Components

• PostfixConstruct — has RWO PVC for queue/data
• WebmailConstruct — has RWO PVC for data
• AdminConstruct — has RWO PVC for data
• RspamdConstruct — has RWO PVC for data

Already Fixed

• DovecotConstruct — already uses kplus.DeploymentStrategy.recreate()

Proposed Fix

Set strategy: kplus.DeploymentStrategy.recreate() on all deployments that mount RWO PVCs, matching the pattern already used by DovecotConstruct.