refactor(comments): remove native comments — social is fediverse-only
Removes routes/comments.js + admin-comments.js (+ mounts), the comment section &
reply UI on posts, comment loading in the post route, the admin moderation page +
links, and the per-site comment-moderation settings. The 'From the fediverse'
section is now the post's comment area. The .comment CSS stays (reused there);
the comments table is left in place (dead) so old-data cascade-deletes still work.
Co-Authored-By: Claude <noreply@…>
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