Replace the monolithic Connectivity page with Services-style subpages:
overview dashboard (aggregated status), per-type connection lists (tunnels/
proxies/ssh/tor) with add/edit forms + lifecycle/health badges + empty states,
a peer+service assignment matrix with per-peer fail-open toggle, and Cell
Network moved under /connectivity/cells. Sidebar gains Connectivity children,
hidden when a type has no instances and its store service isn't installed.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
