feat(sync): validate Hiboutik payloads, read French dates and guard deletions

- Hiboutik payloads are zod schemas, validated by HiboutikClient (getOne
  added for single resources: null on 404 or empty answer).
- Hiboutik dates are read as Europe/Paris whatever the server time zone.
- Paginated lists driving deletions are walked twice when they span several
  pages (brands, categories, products); categories are sorted by id.
- A customer missing from the list is deleted only once Hiboutik confirms
  it; completed orders that lost their customer are linked back.
- Each product and its versions are written in one transaction.
- An email removed in Hiboutik is erased in database.
- A 429 is retried with backoff, then stops the synchronization.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/services/hiboutik/brand.hiboutik.service.ts

@@ -26,7 +26,7 @@ export class BrandHiboutikService {
     );
 
     // Hiboutik is trusted: a successful (2xx) answer, even an empty list, is the truth. An HTTP error throws before this point.
-    const nbDeleted = await this.brandDatabaseRepository.deleteMissing(hiboutikBrands.map((dto) => Number(dto.brand_id)));
+    const nbDeleted = await this.brandDatabaseRepository.deleteMissing(hiboutikBrands.map((dto) => dto.brand_id));
     this.logger.log(
       `Brands sync ended: ${hiboutikBrands.length - nbFailed}/${hiboutikBrands.length} synced, ${nbFailed} failed, ${nbDeleted} deleted.`,
     );