Add shopify:import command for initial product/inventory import

Fetches all products and variants from Shopify API, creates local
Products, Packings and ProductSizes with shopify_variant_id, and
fills ProductInventory rows to match Shopify's inventory_quantity.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Services/ShopifyService.php

@@ -50,10 +50,11 @@ class ShopifyService
             foreach ($response->json('products', []) as $product) {
                 foreach ($product['variants'] as $variant) {
                     $variants[] = [
-                        'id'                => (string) $variant['id'],
-                        'sku'               => $variant['sku'] ?? '',
-                        'inventory_quantity' => (int) ($variant['inventory_quantity'] ?? 0),
-                        'product_title'     => $product['title'],
+                        'id'                 => (string) $variant['id'],
+                        'sku'                => $variant['sku'] ?? '',
+                        'inventory_quantity'  => (int) ($variant['inventory_quantity'] ?? 0),
+                        'product_title'      => $product['title'],
+                        'option1'            => $variant['option1'] ?? '',
                     ];
                 }
             }