refactor: move vantagectl to vantage-ctl
vantagectl/ becomes the root of gitea.hostxtra.co.uk/vantage/vantage-ctl. The command keeps the name vantagectl; only the repository and the image path change, to vantage/vantage-ctl. chart-release.yml's render checks are repointed at the new image. The chart itself has no default backup.image and fails loudly without one, so an existing cluster keeps working until someone changes the value. go.work stays, now with a single use ./server entry: without it a go.work further up the developer's filesystem is picked up instead.
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