Adds scaling_policies table and wires the autoscaler: upsert on every
SetScalingPolicy (including delete-as-disable), LoadPolicies hydrates
policies + service states at boot. Persist failures are logged, never
fatal — in-memory state stays authoritative.
Verified live: policy written on POST, survives a full backend restart,
service state re-registers at min_replicas. Also gofmt-fixes the
drifted databases.go struct tags.
Authored By: TDvorak <[email protected]>
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
