chore: remove dead code and unused dependencies

- Delete 4 unused files detected by knip
- Remove lint-staged, eslint-config-prettier, plausible-tracker
- Clean up knip.json entry patterns

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

@@ -1,4 +0,0 @@
-export { CatalogItemsTable } from "./catalog-items-table";
-export { FurniIcon } from "./furni-icon";
-export type { BaseItemData, CatalogItemData, InlineEdit } from "./types";
-export { DEFAULT_NEW_ITEM, getPointsLabel, POINTS_TYPES } from "./types";