Show Shopify product ID as read-only field next to product name

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

app/Filament/User/Resources/ProductResource.php

@@ -41,6 +41,12 @@ class ProductResource extends Resource {
                 Forms\Components\TextInput::make('title')
                     ->label('Name')
                     ->required(),
+                Placeholder::make('shopify_product_id')
+                    ->label('Shopify ID')
+                    ->content(fn ($record) => $record?->shopify_product_id
+                        ? new HtmlString('<span class="font-mono text-sm">' . e($record->shopify_product_id) . '</span>')
+                        : new HtmlString('<span class="text-sm text-gray-400 italic">Noch nicht in Shopify erstellt</span>')
+                    ),
                 FileUpload::make('images')
                     ->label('Bilder')
                     ->multiple()