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/app/api/admin/import/clone/batch/route.ts

@@ -34,6 +34,7 @@ export const POST = withAdmin(
 		const body = await request.json();
 		const sourceId: string = body.sourceId || "";
 		const rawClassnames: string[] = body.classnames || [];
+		const isFinal = body.final === true;
 
 		if (!sourceId) return apiError("Missing sourceId", 400);
 		if (rawClassnames.length === 0)
@@ -65,8 +66,8 @@ export const POST = withAdmin(
 			}
 		}
 
-		if (items.length > 500)
-			return apiError("Too many classnames (max 500)", 400);
+		if (items.length > 5000)
+			return apiError("Too many classnames (max 5000)", 400);
 
 		// FurnitureData entries for successfully cloned items are appended once
 		// at the end (single read-modify-write instead of one per item), which
@@ -138,6 +139,8 @@ export const POST = withAdmin(
 					);
 				}
 
+				if (!isFinal) return;
+
 				// Post-import consolidation, mirroring the furni batch route:
 				// force offer_id to mirror its catalog row id, keep the
 				// FurnitureData in sync with the new local sprite ids, verify