fix(catalog): keep only Hyundai/Kia/Nissan on de (Ford/Polestar not de-fixable)

Tested Ford & Polestar on de: Ford returns a real variant tree but drilling can't
reach parts (needs dedicated Ford variant-drill logic); Polestar returns 0
categories (data gap). Revert them to tr; keep the verified Hyundai/Kia/Nissan
de-routing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/api/src/integrations/pl24/pl24-ford-legacy.service.ts

@@ -49,15 +49,11 @@ export interface P4BrandHooks {
 // Brands whose parts are licensed only on the de (account 2) PL24 subscription —
 // the tr account serves a NOT_LOGGED_IN_DEMO page for these. All P4 fetches for
 // these services are routed to de (see fetchP4Page + resolveAccount).
-const HYUNDAI_KIA_NISSAN_DE = new Set([
-  "hyundai_parts",
-  "kia_parts",
-  "nissan_parts",
-  // TEMP under test: do Ford/Polestar also work on de?
-  "fordp_parts",
-  "fordt_parts",
-  "polestar_parts",
-]);
+const HYUNDAI_KIA_NISSAN_DE = new Set(["hyundai_parts", "kia_parts", "nissan_parts"]);
+// Tested on de but NOT helped: Ford (de gives a real variant tree but the current
+// drill logic can't reach parts through Ford's engine/transmission variant nodes —
+// needs dedicated Ford variant-drill work); Polestar (de returns 0 categories — data
+// gap). Fiat stays on de via resolveAccount but its model-list needs launchCatalog.do.
 
 @Injectable()
 export class PL24FordLegacyService {