Surface the existing /manage/reverse-proxy/troubleshooting page in the
Troubleshooting section: add it to the Connectivity sidebar group, and
move its hub chip from the Self-hosted card to Connectivity & networking
so the hub and sidebar agree.
The page covers reaching services exposed through routing peers, which
is a connectivity concern rather than self-hosted control-plane infra.
No new page and no duplicated content: both are pointers to the one
existing page.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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