Add bulk CSV product import for POS (retail + restaurant)

Customers with large catalogs can upload a CSV instead of adding products one by
one. Mode-aware: restaurant imports into the local catalog (chunked INSERT,
categories resolved/created by name); retail batches to the CRM products/bulk
endpoint. Streamed parsing + batched writes handle thousands of rows in one
request. Includes a downloadable template, an Import button on both product
pages, and a skipped-rows report.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Services/Crm/CrmClient.php

@@ -36,6 +36,17 @@ class CrmClient
         return $this->send('post', 'products', $data);
     }
 
+    /**
+     * Bulk-create products (one CRM INSERT per call). Caller batches large
+     * catalogs; the CRM caps each request at 500 rows.
+     *
+     * @param  array<int, array<string, mixed>>  $products
+     */
+    public function bulkCreateProducts(array $products): array
+    {
+        return $this->send('post', 'products/bulk', ['products' => array_values($products)]);
+    }
+
     public function updateProduct(int|string $id, array $data): array
     {
         return $this->send('patch', "products/{$id}", $data);