Add Shopify pull-from feature and fix product creation payload

- Add "Aus Shopify laden" button on product edit page that pulls description
  and variant prices/SKUs/GTINs from Shopify back into SMS
- Add ShopifyService::getProduct() for fetching a single product
- Add 'options' to createProduct() payload so Shopify properly creates variants
  (without it Shopify ignores variant option values)
- Add request/response logging to createProduct() for diagnosing transfer issues
- Remove dead code from ProductResource (mutateFormData*, getRecord, getActions)
- Clean up imports in ProductResource

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

app/Services/ShopifyService.php

@@ -2,6 +2,7 @@
 
 namespace App\Services;
 
+use App\Models\Product;
 use App\Models\ProductSize;
 use Illuminate\Support\Facades\Http;
 use Illuminate\Support\Facades\Log;
@@ -76,14 +77,38 @@ class ShopifyService
         return $variants;
     }
 
-    public function createProduct(\App\Models\Product $product, \Illuminate\Support\Collection $sizes): array
+    public function getProduct(string $shopifyProductId): array
+    {
+        $response = Http::withHeader('X-Shopify-Access-Token', $this->token)
+            ->get("{$this->baseUrl}/products/{$shopifyProductId}.json");
+
+        if ($response->failed()) {
+            throw new \RuntimeException(
+                'Shopify-Fehler ' . $response->status() . ': ' . $response->body()
+            );
+        }
+
+        $p = $response->json('product');
+
+        return [
+            'description' => strip_tags($p['body_html'] ?? ''),
+            'variants'    => collect($p['variants'] ?? [])->map(fn ($v) => [
+                'shopify_variant_id' => (string) $v['id'],
+                'price'              => (float) ($v['price'] ?? 0),
+                'sku'                => $v['sku'] ?? null,
+                'gtin'               => $v['barcode'] ?? null,
+            ])->all(),
+        ];
+    }
+
+    public function createProduct(Product $product, \Illuminate\Support\Collection $sizes): array
     {
         $variants = $sizes->map(fn (ProductSize $s) => array_filter([
             'option1' => $s->packing->name . ' ' . $s->packing->size . 'g',
             'price'   => number_format((float) $s->price, 2, '.', ''),
             'sku'     => $s->sku ?: null,
             'barcode' => $s->gtin ?: null,
-        ]))->values()->toArray();
+        ], fn ($v) => $v !== null))->values()->toArray();
 
         $body = [
             'product' => [
@@ -91,6 +116,7 @@ class ShopifyService
                 'body_html' => $product->description
                     ? '<p>' . nl2br(e($product->description)) . '</p>'
                     : '',
+                'options'   => [['name' => 'Größe']],
             ],
         ];
 
@@ -98,9 +124,20 @@ class ShopifyService
             $body['product']['variants'] = $variants;
         }
 
+        Log::info('Shopify createProduct request', [
+            'product_id' => $product->id,
+            'sizes'      => $sizes->count(),
+            'body'       => $body,
+        ]);
+
         $response = Http::withHeader('X-Shopify-Access-Token', $this->token)
             ->post("{$this->baseUrl}/products.json", $body);
 
+        Log::info('Shopify createProduct response', [
+            'status' => $response->status(),
+            'body'   => $response->json(),
+        ]);
+
         if ($response->failed()) {
             throw new \RuntimeException(
                 'Shopify-Fehler ' . $response->status() . ': ' . $response->body()