chore: update import paths and registry refs after move to gitea (#307)
Repo moved from GitLab to Gitea (git.unbound.se). Updates Go module path, all internal Go imports, Renovate registry pkg name, .buildtools.yaml registry block, and Dockerfile (drops obsolete GOPRIVATE + GITLAB_USER/GITLAB_TOKEN). Reviewed-on: #307
This commit was merged in pull request #307.
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