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/Console/Commands/ShopifyImport.php

@@ -0,0 +1,103 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\Packing;
+use App\Models\Product;
+use App\Models\ProductInventory;
+use App\Models\ProductSize;
+use App\Services\ShopifyService;
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\DB;
+
+class ShopifyImport extends Command
+{
+    protected $signature   = 'shopify:import {--dry-run : Nur anzeigen, nichts speichern}';
+    protected $description = 'Importiert Produkte und Lagerbestand direkt aus der Shopify API';
+
+    public function handle(ShopifyService $shopify): int
+    {
+        $dryRun = $this->option('dry-run');
+        $variants = $shopify->getAllVariants();
+
+        if (empty($variants)) {
+            $this->error('Keine Varianten von Shopify erhalten (Details im Log).');
+            return self::FAILURE;
+        }
+
+        $this->info('Shopify-Varianten geladen: ' . count($variants));
+
+        $stats = ['products' => 0, 'sizes' => 0, 'inventory' => 0, 'skipped' => 0];
+
+        DB::transaction(function () use ($variants, $dryRun, &$stats) {
+            foreach ($variants as $variant) {
+                $packingRaw = $variant['option1'];
+
+                // Format: "Standbodenbeutel 100 g" oder "Metalldose 40 g"
+                if (! preg_match('/^(.+?)\s+(\d+(?:[.,]\d+)?)\s*g$/i', $packingRaw, $m)) {
+                    $this->warn("  ⚠ Verpackungsformat nicht erkannt: '{$packingRaw}' ({$variant['sku']}) – übersprungen");
+                    $stats['skipped']++;
+                    continue;
+                }
+
+                if ($dryRun) {
+                    $this->line("  {$variant['product_title']} | {$packingRaw} | SKU {$variant['sku']} | Bestand {$variant['inventory_quantity']}");
+                    continue;
+                }
+
+                $packing = Packing::firstOrCreate([
+                    'name' => trim($m[1]),
+                    'size' => (float) str_replace(',', '.', $m[2]),
+                ]);
+
+                $product = Product::firstOrCreate(
+                    ['title' => $variant['product_title']],
+                    ['recipes_id' => null],
+                );
+                if ($product->wasRecentlyCreated) {
+                    $stats['products']++;
+                }
+
+                $size = ProductSize::firstOrCreate(
+                    ['product_id' => $product->id, 'packing_id' => $packing->id],
+                    ['sku' => $variant['sku'], 'shopify_variant_id' => $variant['id'], 'price' => 0],
+                );
+
+                // Bestehende Size ohne Variant-ID nachträglich verknüpfen
+                if (! $size->wasRecentlyCreated && ! $size->shopify_variant_id) {
+                    $size->update(['shopify_variant_id' => $variant['id'], 'sku' => $variant['sku']]);
+                }
+
+                if ($size->wasRecentlyCreated) {
+                    $stats['sizes']++;
+                }
+
+                // Lagerbestand: aktuelle Differenz auffüllen
+                $localQty = ProductInventory::where('size_id', $size->id)->whereNull('out_at')->count();
+                $diff = $variant['inventory_quantity'] - $localQty;
+
+                if ($diff > 0) {
+                    for ($i = 0; $i < $diff; $i++) {
+                        ProductInventory::create([
+                            'product_id' => $product->id,
+                            'size_id'    => $size->id,
+                        ]);
+                    }
+                    $stats['inventory'] += $diff;
+                }
+            }
+        });
+
+        if (! $dryRun) {
+            $this->info("✓ {$stats['products']} Produkte erstellt");
+            $this->info("✓ {$stats['sizes']} Varianten erstellt");
+            $this->info("✓ {$stats['inventory']} Lagereinträge erstellt");
+        }
+
+        if ($stats['skipped']) {
+            $this->warn("⚠ {$stats['skipped']} Varianten übersprungen (Verpackungsformat unbekannt)");
+        }
+
+        return self::SUCCESS;
+    }
+}