fix(server): explain a disabled tailnet Serve instead of timing out (#10958)

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: Julius Marminge <51714798+juliusmarminge@users.noreply.github.com>
639ac5ec77Seth committed on 10/20/2026, 2:47:40 AM· committed by GitHubparentb912bd2
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