Add updateExisting option to furniture import

- Added updateExisting parameter to importSingleFurni and API routes
- When updateExisting=true, existing items are updated (catalog price/page) instead of failing
- Added catalogUpdated flag to ImportSingleResult
- Updates existing catalog entries (price, page) instead of skipping duplicates

src/app/api/admin/import/furni/route.ts

@@ -297,6 +297,7 @@ export const POST = withAdmin(
 						type: item.type ?? "flooritem",
 						revision: item.revision ?? 0,
 						category: item.category ?? "unknown",
+						updateExisting: body.updateExisting === true,
 						sourceSwfBaseUrl: source?.sourceSwfBaseUrl,
 						nitroBaseUrl: source?.nitroBaseUrl || undefined,
 						iconBaseUrl: source?.iconBaseUrl || undefined,
@@ -359,6 +360,7 @@ export const POST = withAdmin(
 			revision,
 			category,
 			sourceId,
+			updateExisting,
 		} = body;
 
 		if (!classname || !name) return apiError("Missing classname or name", 400);
@@ -374,6 +376,7 @@ export const POST = withAdmin(
 			type: type ?? "flooritem",
 			revision: revision ?? 0,
 			category: category ?? "unknown",
+			updateExisting: updateExisting === true,
 			sourceSwfBaseUrl: source?.sourceSwfBaseUrl,
 			nitroBaseUrl: source?.nitroBaseUrl || undefined,
 			iconBaseUrl: source?.iconBaseUrl || undefined,