Add SKU/GTIN fields, live barcode preview, and Shopify price import

- Add SKU and GTIN fields to product variant repeater
- Render EAN/UPC barcode live from GTIN input (picqer/php-barcode-generator)
- Pull variant price from Shopify API instead of defaulting to 0
- Sync sku/gtin through EditProduct and CreateProduct save logic

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

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
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+    "content-hash": "45cc716f18a426dc09aceb48f3a350d8",
     "packages": [
         {
             "name": "anourvalar/eloquent-serialize",
@@ -4055,6 +4055,86 @@
             ],
             "time": "2026-08-24T00:54:40+00:00"
         },
+        {
+            "name": "picqer/php-barcode-generator",
+            "version": "v3.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/picqer/php-barcode-generator.git",
+                "reference": "6beada2a30623832ff41b8c7d307c169736b8552"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/picqer/php-barcode-generator/zipball/6beada2a30623832ff41b8c7d307c169736b8552",
+                "reference": "6beada2a30623832ff41b8c7d307c169736b8552",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^8.2"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.10",
+                "phpunit/phpunit": "^9.5"
+            },
+            "suggest": {
+                "ext-bcmath": "Barcode IMB (Intelligent Mail Barcode) needs bcmath extension",
+                "ext-gd": "For JPG and PNG generators, GD or Imagick is required",
+                "ext-imagick": "For JPG and PNG generators, GD or Imagick is required"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Picqer\\Barcode\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "LGPL-3.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Casper Bakker",
+                    "email": "info@picqer.com",
+                    "homepage": "https://picqer.com"
+                },
+                {
+                    "name": "Nicola Asuni",
+                    "email": "info@tecnick.com",
+                    "homepage": "http://nicolaasuni.tecnick.com"
+                }
+            ],
+            "description": "An easy to use, non-bloated, barcode generator in PHP. Creates SVG, PNG, JPG and HTML images from the most used 1D barcode standards.",
+            "homepage": "https://github.com/picqer/php-barcode-generator",
+            "keywords": [
+                "CODABAR",
+                "Code11",
+                "Code93",
+                "EAN13",
+                "KIX",
+                "KIXCODE",
+                "MSI",
+                "POSTNET",
+                "Pharma",
+                "Standard 2 of 5",
+                "barcode",
+                "barcode generator",
+                "code128",
+                "code39",
+                "ean",
+                "html",
+                "jpeg",
+                "jpg",
+                "php",
+                "png",
+                "svg",
+                "upc"
+            ],
+            "support": {
+                "issues": "https://github.com/picqer/php-barcode-generator/issues",
+                "source": "https://github.com/picqer/php-barcode-generator/tree/v3.3.0"
+            },
+            "time": "2026-08-22T09:50:32+00:00"
+        },
         {
             "name": "psr/cache",
             "version": "3.0.0",