Replace standalone catalog editor with the unified Visual Catalog studio

Make /admin/catalog a full-screen catalog studio that replaces the old
listing plus separate [id]/builder-club detail pages:

- Embed CatalogManagerWorkspace on /admin/catalog with a Normal/Builder
  Club toggle, Catalog Sync status, packages (normal), Organize imports
  and a diagnostics link to /admin/studio/maintenance.
- Manage BC items directly in the studio Items tab (new BcItemsEditor,
  CRUD via existing bc actions; /api/admin/catalog/items now serves BC).
- Inline editor: add pageTextTeaser field for both catalogs and remove
  the legacy full-editor links.
- Remove the 'Open full editor' context action from the tree.
- Move catalog-items-table (dir + barrel) and catalog-translate-tab out
  of the app route into src/components/admin/catalog and update all
  importers.
- Keep /admin/catalog/[id], builder-club/[id] and /admin/catalog/maintenance
  as redirects into the new studio; consolidate maintenance panels into
  /admin/studio/maintenance and point the nav item there.
- Delete the old listing/table/tabs/forms and the standalone bc-manager.

src/features/catalog/components/bulk-offer-editor.tsx

@@ -9,8 +9,8 @@ import {
 	previewBulkOffers,
 	undoBulkOffers,
 } from "@/actions/catalog-bulk";
-import { MovePageCombobox } from "@/app/admin/catalog/[id]/catalog-items-table/field-helpers";
-import { POINTS_TYPES } from "@/app/admin/catalog/[id]/catalog-items-table/types";
+import { MovePageCombobox } from "@/components/admin/catalog/catalog-items-table/field-helpers";
+import { POINTS_TYPES } from "@/components/admin/catalog/catalog-items-table/types";
 import {
 	CurrencyIcon,
 	currencyKindFromPointsType,

src/features/catalog/components/duplicate-category-dialog.tsx

@@ -7,7 +7,7 @@ import {
 	catalogDuplicateDestinations,
 	previewCatalogDuplicate,
 } from "@/actions/catalog-duplicate";
-import { MovePageCombobox } from "@/app/admin/catalog/[id]/catalog-items-table/field-helpers";
+import { MovePageCombobox } from "@/components/admin/catalog/catalog-items-table/field-helpers";
 import { Button } from "@/components/ui/button";
 import {
 	Dialog,

src/features/catalog/domain/offer-discovery.ts

@@ -1,4 +1,4 @@
-import type { CatalogItemData } from "@/app/admin/catalog/[id]/catalog-items-table/types";
+import type { CatalogItemData } from "@/components/admin/catalog/catalog-items-table/types";
 
 export const OFFER_FILTERS = [
 	"all",

src/features/catalog/domain/organize.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import type { CatalogItemData } from "@/app/admin/catalog/[id]/catalog-items-table/types";
+import type { CatalogItemData } from "@/components/admin/catalog/catalog-items-table/types";
 import {
 	buildSortOrders,
 	groupSuggestedCategories,

src/features/catalog/domain/organize.ts

@@ -1,4 +1,4 @@
-import type { CatalogItemData } from "@/app/admin/catalog/[id]/catalog-items-table/types";
+import type { CatalogItemData } from "@/components/admin/catalog/catalog-items-table/types";
 import type { CatalogLayout } from "@/lib/catalog-layouts";
 
 export type SortStrategy =