Feat: Restructuring MigrateImport, Dispatching a per product job for import

src/Catalog/Services/SkuBackfillService.php

@@ -8,15 +8,16 @@ use Lunar\Models\ProductVariant;
  * Generates a SKU for every ProductVariant missing one — extracted out of
  * Command\BackfillMissingSkusCommand (which becomes a thin CLI wrapper
  * around this, keeping --dry-run/progress-bar concerns out of the
- * reusable logic) so MigrateImport\RunMigrateImportJob can also call it
- * directly, right after a Shopify import, with no CLI concerns at all.
+ * reusable logic) so MigrateImport\Shopify\Services\ShopifyExportImporter can
+ * also call it directly, once every product job in its import batch has
+ * finished (see that class's own import()), with no CLI concerns at all.
  *
  * Format is "SKU-P{product_id}-V{variant_id}": deterministic and
  * guaranteed unique without a uniqueness check, since product_id/
  * variant_id already are. Only variants with a null `sku` are touched —
  * not an importer bug when one shows up after a Shopify import, the
  * source CSV rows genuinely had no `Variant SKU` value (see
- * MigrateImport\Shopify\ShopifyExportImporter).
+ * MigrateImport\Shopify\Services\ShopifyExportImporter).
  */
 class SkuBackfillService
 {