feat: add automatic catalog organization for all imported furniture

Add a fully automatic "Organize all" action in the Studio that organizes
the entire database into catalog pages:

- Create a dedicated sub-page per furniture line (e.g. weebz, habbox) from
  FurnitureData.json, falling back to the auto-detected category.
- Add missing purchasable items to the catalog on their line/category page.
- Re-home and re-price existing catalog entries onto their correct page.
- Pages are created automatically when missing; no manual selection needed.

Includes the organizeCatalogAll service, a POST /api/admin/import/furni/organize
endpoint, and the Studio button.

src/components/admin/studio/studio-client.tsx

@@ -514,6 +514,37 @@ export function StudioClient({
 		}
 	};
 
+	const [organizing, setOrganizing] = useState(false);
+
+	async function organizeAll() {
+		if (organizing) return;
+		setOrganizing(true);
+		try {
+			const res = await adminFetch("/api/admin/import/furni/organize", {
+				method: "POST",
+			});
+			const data = await res.json();
+			if (res.ok) {
+				const parts = [
+					`Catalogus georganiseerd`,
+					data.pagesCreated > 0
+						? `${data.pagesCreated} pagina's aangemaakt`
+						: null,
+					data.catalogAdded > 0 ? `${data.catalogAdded} nieuw` : null,
+					data.catalogRehomed > 0 ? `${data.catalogRehomed} bijgewerkt` : null,
+				].filter(Boolean);
+				toast.success(parts.join(" · "));
+				fetchStats();
+			} else {
+				toast.error(data.error || "Organiseren mislukt");
+			}
+		} catch {
+			toast.error("Netwerkfout");
+		} finally {
+			setOrganizing(false);
+		}
+	}
+
 	async function deleteItem() {
 		if (!deleting) return;
 		try {
@@ -844,6 +875,22 @@ export function StudioClient({
 
 				<div className="flex-1" />
 
+				<Button
+					size="sm"
+					variant="outline"
+					className="gap-1.5"
+					disabled={organizing || !!batchProgress}
+					onClick={organizeAll}
+					title="Alle meubels automatisch in catalogus-pagina's ordenen (pagina's worden aangemaakt indien nodig)"
+				>
+					{organizing ? (
+						<Loader2 size={14} className="animate-spin" />
+					) : (
+						<WandSparkles size={14} />
+					)}
+					Organiseer alles
+				</Button>
+
 				{selectedNonImported > 0 && (
 					<Button
 						size="sm"