Configure SSH deploy secrets for CD environments

[Hqzdev]

Problem

CD can now build and push GHCR images successfully, but SSH deploy is skipped because the repository/environments do not have deploy settings configured.

Latest green CD run: https://github.com/Hqzdev/Metrix/actions/runs/27086713241

Missing settings observed

Repository-level Actions secrets and variables are empty, and the staging / Production environments also have no deploy secrets or variables configured.

Required settings:

• SSH_HOST_STAGING
• SSH_HOST_PRODUCTION
• SSH_USER
• SSH_PRIVATE_KEY
• SSH_KNOWN_HOSTS
• variable DEPLOY_PATH

Notes

• Previous CD failed because GHCR image paths used uppercase Hqzdev; fixed in PR fix(cd): normalize ghcr image deploys #39.
• Rollback no longer runs after upstream build/deploy configuration failures.
• Until these settings are configured, CD intentionally runs build/push only and skips SSH deploy jobs.