Closes the infra-guacamole OutOfSync sync loop. K8s API sets
volumeMode=Filesystem as a default on volumeClaimTemplates at creation,
but the git manifest omitted it. ArgoCD uses ServerSideApply with
atomic ownership of volumeClaimTemplates, so every sync saw a
desired/live mismatch on that one field. volumeClaimTemplates is
immutable after creation so ArgoCD could never reconcile it --
autoHealAttemptsCount climbed to 6091. Adding the field to git
matches live and breaks the loop.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>