Public server activity page — the browser view of the /<resource>/stats
endpoints.
Anonymous like the endpoints it mirrors, and gated by the same
:public_stats flag, so turning stats off closes the page and the API
together rather than leaving a second way in.
Rendered once on mount from Gamend.Analytics.snapshot/0 — the same cached
composition the admin index and /api/v1/stats read, so every surface shows
one set of numbers. Live-updating would mostly re-render identical values;
a page reload is the refresh.