feat(catalog): prevent and repair Arcturus emulator data errors

Block invalid catalog_items writes at the API level (points currency
allowlist, non-negative prices, positive amount, limited stack >= sold
count, unique sibling order numbers) and auto-assign unique order numbers
on bulk create. Add a catalog-maintenance scan + transactional repair that
fixes pre-existing rows: resets unsupported points_type, clamps negative
costs, sets amount to 1, raises limited_stack, renumbers duplicate orders
and deletes offers with missing page/item references. Surface the issue
count and a fix button in the admin maintenance panel.

Also: add enabled/retired flag to clone sources, classify poster and
currency furniture in item-kind, and remove the obsolete update-Nitrov3.sh.

src/app/admin/import/clone/import-clone-client.tsx

@@ -40,6 +40,7 @@ interface CloneSource {
 	nitroBaseUrl: string;
 	iconBaseUrl: string;
 	hotel: string;
+	enabled?: boolean;
 }
 
 interface FurniItem {
@@ -81,6 +82,7 @@ function SourceForm({ initial, onSave, onCancel, saving }: SourceFormProps) {
 	const [nitroBaseUrl, setNitroBaseUrl] = useState(initial?.nitroBaseUrl ?? "");
 	const [iconBaseUrl, setIconBaseUrl] = useState(initial?.iconBaseUrl ?? "");
 	const [hotel, setHotel] = useState(initial?.hotel ?? "");
+	const [enabled, setEnabled] = useState(initial?.enabled ?? true);
 
 	async function handleSubmit(e: React.FormEvent) {
 		e.preventDefault();
@@ -91,6 +93,7 @@ function SourceForm({ initial, onSave, onCancel, saving }: SourceFormProps) {
 			nitroBaseUrl,
 			iconBaseUrl,
 			hotel,
+			enabled,
 		});
 	}
 
@@ -140,6 +143,15 @@ function SourceForm({ initial, onSave, onCancel, saving }: SourceFormProps) {
 						))}
 					</SelectContent>
 				</Select>
+				<label className="flex items-center gap-2 text-sm">
+					<input
+						type="checkbox"
+						checked={enabled}
+						onChange={(e) => setEnabled(e.target.checked)}
+						className="h-4 w-4 rounded border-input"
+					/>
+					Enabled (retired sources are excluded from counts and imports)
+				</label>
 			</div>
 			<div className="flex gap-2">
 				<Button type="submit" size="sm" disabled={saving}>