feat(pcat): translate part descriptions + vehicle attrs (body/engine/transmission)

PCAT was missing parity with EMEX in two places:
- Part `description` (notice) was stored raw English alongside translated `name`.
  Now batched into translateMany so users see Turkish notices.
- Vehicle body/engine/transmission attrs from VIN decode were raw upstream
  values. Wire up the existing emex.mapper dictionaries on the PCAT
  single-car, PCAT resolveById, and EMEX single-vehicle result paths.
- emex.mapper translateToTurkish now falls back to the original term on
  dictionary miss instead of null — upstream values are heterogeneous
  (engine codes, multi-word descriptors); losing them was worse than
  leaving them untranslated.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/api/src/categories/categories.service.ts

@@ -705,9 +705,10 @@ export class CategoriesService {
                 }
               }
 
-              const trMap = await this.translationsService.translateMany(
-                rawParts.map((p) => p.name).filter(Boolean),
-              );
+              const trMap = await this.translationsService.translateMany([
+                ...rawParts.map((p) => p.name).filter(Boolean),
+                ...rawParts.map((p) => p.notice).filter((n): n is string => !!n),
+              ]);
 
               const allParts: Array<typeof parts.$inferInsert> = rawParts.map((p) => ({
                 vehicleId: vehicle.id,
@@ -715,7 +716,7 @@ export class CategoriesService {
                 oemCode: p.number,
                 name: trMap.get(p.name) ?? p.name ?? "Unknown",
                 nameOriginal: p.name || null,
-                description: p.notice,
+                description: p.notice ? (trMap.get(p.notice) ?? p.notice) : null,
                 quantity: null,
                 position: p.positionNumber,
                 hotspotIndex: p.positionNumber