a gallery is a carousel

It always rendered as one — data-carousel, a snap track, two arrows, driven by
carousel.client.js. The entity was the last thing still calling it something
else, and that collided with the site's own Gallery section: two nav rows
reading Gallery and Galleries, meaning a list of objects and a list of
photograph sets.

GalleriesPanel, GalleryPicker and GalleryItems become Carousels*, the endpoint
becomes /fofos-admin/carousels, the block kind becomes carousel and
subject-gallery becomes subject-carousel. The publish allowlist follows the
renamed tables.

What did NOT move: GALLERY_CONFIG at /fofos-admin/gallery, subjects.ts's
base '/gallery', and home_gallery_media. Those are the Gallery section and the
legacy rows, and both are correct.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

web/sections/BandBlocks.tsx

@@ -13,7 +13,7 @@ import type { CanvasComponent, CanvasSection } from '../canvas';
  *
  * The page's structure nests this under every band, and the band's own editor shows just its own.
  * They are the same list of the same things with the same actions, so they are the same component —
- * the galleries panel taught that lesson once already.
+ * the carousels panel taught that lesson once already.
  *
  * ── Columns, because adding needs one ──
  *