repo mirror list: drop the redundant CLUSTER column
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The cluster host is already embedded in the clone URL (entire://<cluster>/gh/<owner>/<repo>), so a separate CLUSTER column just repeated it. The human view is now REPO / CLONE URL / PRIVATE.
Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com Entire-Checkpoint: aba37fc3d99c
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