feat(fediverse): add an ActivityPub on/off toggle (off = no federation, no comments)
A solo site can now run without the fediverse. ap_enabled (default on, Beheer ->
Instellingen). When off: /ap/*, WebFinger and NodeInfo 404 (undiscoverable), the
'from the fediverse' reactions section is hidden on posts (= no comments, since
native comments were removed), the profile follow button and the fediverse admin
links disappear. Cirkels is separate (not gated here).
Co-Authored-By: Claude <noreply@…>
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