Route all Coolify update artifacts (versions.json, upgrade.sh,
compose files) through updates.mapledeploy.ca instead of upstream
cdn.coollabs.io. Extend CI to publish artifacts to Bunny CDN
storage zone and purge cache on each build.
- Point CDN_URL, versions_url, upgrade_script_url to updates.mapledeploy.ca
- Hardcode helper/realtime images to ghcr.io (not mirrored to Forgejo)
- Pass registry_url as 3rd arg to upgrade.sh for main image pulls
- Adopt versioning scheme 4.0.0-beta.X.N (bump to 4.0.0-beta.463.1)
- Add CI steps: generate versions.json, upload to Bunny, purge cache
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