fix: skip heavy post-import consolidation on non-final clone chunks

The flush after every 400-item chunk was running expensive operations
(reconcileOfferIds, rebuildCatalog, verifySpriteIds, rcon updates) which
caused the import to hang after ~800 items. Now only the final chunk
triggers the full consolidation. Also raised the per-request limit from
500 to 5000 items.

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

@@ -444,6 +444,7 @@ export function StudioClient({
 			for (let i = 0; i < classnames.length; i += CHUNK) {
 				if (abort.signal.aborted) break;
 				const chunk = classnames.slice(i, i + CHUNK);
+				const isLast = i + CHUNK >= classnames.length;
 
 				const res = await adminFetch("/api/admin/import/clone/batch", {
 					method: "POST",
@@ -452,6 +453,7 @@ export function StudioClient({
 						sourceId: activeSource,
 						classnames: chunk,
 						concurrency: 10,
+						final: isLast,
 					}),
 					signal: abort.signal,
 				});
@@ -853,6 +855,7 @@ export function StudioClient({
 					sourceId: activeSource,
 					classnames: failed,
 					concurrency: 10,
+					final: true,
 				}),
 				signal: abort.signal,
 			});