The Prometheus scrape config for the kubernetes-nodes job kept
capacity_bytes + used_bytes but dropped available_bytes. pvc-autoresizer
computes utilization from available/capacity, so without that metric it
was silent for every PVC in the cluster — including mailserver, which
filled to 89% (1.7G/2.0G) and started rejecting all inbound mail with
'452 4.3.1 Insufficient system storage' (15+ hours, all real senders:
Brevo, Gmail, Facebook).
Also bumps the floors of mailserver (2Gi -> 5Gi, limit 10Gi) and forgejo
(15Gi -> 30Gi) PVCs to recover from the immediate outage, and adds
ignore_changes on requests.storage so future autoresizer expansions
don't cause TF drift.
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