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/PartnersEditor.tsx

@@ -19,7 +19,7 @@ import { thumbUrl } from '../thumbnail';
  * That is worth saying out loud in the panel, because the editor sits inside a block on a page and
  * everything else in that column belongs to the page.
  *
- * ── The same shape as GalleryItems ──
+ * ── The same shape as CarouselItems ──
  *
  * Drag to reorder, a grip on the left, one write at the end carrying every id. Deliberately, so the
  * two ordered lists in this admin are the same gesture rather than two things to learn.
@@ -64,7 +64,7 @@ export const PartnersEditor = ({ onChanged }: { onChanged?: () => void }) => {
     }
   };
 
-  /* Reordering, live. Same as GalleryItems — see the note there. */
+  /* Reordering, live. Same as CarouselItems — see the note there. */
   const [dragged, setDragged] = useState<number | null>(null);
   const orderedRef = useRef<Partner[] | null>(null);