Add shutdown controller recovery power status

[FriedCircuits]

Summary

Adds recovery power-on support and target-level observability to the Proxmox shutdown controller.

Changes

• Start the recovery helper when line power returns and Ceph noout still needs cleanup.
• Add IPMI power-on support for generic recovery targets.
• Add Turing Pi recovery power-on support through tpi power over SSH to the backplane.
• Track recovery power target progress, failures, and Kubernetes readiness blockers in retained MQTT state.
• Add Home Assistant MQTT discovery entities and example dashboard/package updates for the new recovery fields.
• Bump the MQTT schema version so retained discovery is refreshed.

Impact

Home Assistant can now show what recovery is waiting on without opening logs: failed power targets, last power target/method, K8s nodes not ready, and whether recovery power-on/K8s readiness completed.

Validation

• terraform fmt -check -recursive modules/proxmox/shutdown-controller
• sh -n modules/proxmox/shutdown-controller/templates/controller.sh.tftpl
• sh -n modules/proxmox/shutdown-controller/templates/recovery.sh.tftpl
• Parsed Home Assistant example YAML with Python/PyYAML
• git diff --check -- modules/proxmox/shutdown-controller
• terraform init -backend=false -input=false && terraform validate in modules/proxmox/shutdown-controller