Spoor A step 1: bake post display HTML at save (ActivityPub source model)
Introduce the source/rendered split: posts.content stays the raw source (what
the editor round-trips), a new content_rendered column holds the baked display
HTML. bakePostContent() runs the linkify pipeline once at create/edit and
caches it; the render route serves content_rendered (falling back to an
on-the-fly bake for not-yet-baked posts) and no longer re-linkifies every view.
Verified: baked and fallback paths render byte-identically and a baked lone URL
still becomes an embed. This is the seam for step 2 (resolve @mentions once at
save instead of per page view) and removes the per-render linkify cost.
Co-Authored-By: Claude Opus 4.8 <noreply@…>
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