Add public user-products storefront API and website docs.

Expose published customer listings under /tenants/:host/user-products (list, search, details, technical-info) and document them in the website API pack.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/business-settings/business-settings.service.ts

@@ -78,6 +78,7 @@ export class BusinessSettingsService {
         ),
         defaultLocale:
           dto.branding.defaultLocale ?? current.branding.defaultLocale,
+        themeMode: dto.branding.themeMode ?? current.branding.themeMode,
       };
     }