Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/admin/catalog/[id]/catalog-items-table.tsx

@@ -0,0 +1,7 @@
+/**
+ * Re-export barrel for backward compatibility.
+ * Implementation moved to ./catalog-items-table/ directory.
+ */
+export { CatalogItemsTable } from './catalog-items-table/catalog-items-table'
+export { FurniIcon } from './catalog-items-table/furni-icon'
+export type { BaseItemData, CatalogItemData } from './catalog-items-table/types'