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/integrations/emex/emex.mapper.ts

@@ -91,7 +91,11 @@ function translateToTurkish(
 ): string | null {
   if (!term) return null;
   const normalized = term.toLowerCase().trim();
-  return dictionary[normalized] || null;
+  // Dictionary miss → return original term unchanged. Upstream values are
+  // often heterogeneous (engine codes, multi-word descriptors) that the
+  // single-word dictionary can't cover; losing them would be worse than
+  // leaving them untranslated.
+  return dictionary[normalized] ?? term;
 }
 
 export function translateBodyType(bodyType: string | null): string | null {