Link retail POS products to the CRM products API (restaurant stays local)

Products are now mode-aware:
- Retail: the catalog lives in Ladill CRM. The Products page proxies CRUD to the
  CRM products API (CrmClient gains product/create/update/delete), and the
  register reads CRM products live; a sold line is stored as a name/price
  snapshot (product_id null, since CRM products aren't local rows). Resilient —
  the register shows an empty catalog if CRM is unreachable. CRM import is hidden
  in Settings (not needed when reading live).
- Restaurant: unchanged — the local pos_products catalog keeps its POS-only depth
  (category, kitchen station, course, modifier groups).

ProductController routes take a raw {product} id (CRM id in retail, local id in
restaurant). Suite green (17), covering both modes.

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

app/Services/Crm/CrmClient.php

@@ -26,6 +26,26 @@ class CrmClient
         return $this->get('products', $filters);
     }
 
+    public function product(int|string $id): array
+    {
+        return $this->get("products/{$id}");
+    }
+
+    public function createProduct(array $data): array
+    {
+        return $this->send('post', 'products', $data);
+    }
+
+    public function updateProduct(int|string $id, array $data): array
+    {
+        return $this->send('patch', "products/{$id}", $data);
+    }
+
+    public function deleteProduct(int|string $id): array
+    {
+        return $this->send('delete', "products/{$id}", []);
+    }
+
     public function pushTimeline(array $data): array
     {
         return $this->post('timeline', $data);
@@ -51,6 +71,11 @@ class CrmClient
         return $this->handle(fn () => $this->client()->post($path, [...$data, 'owner' => $this->owner]));
     }
 
+    private function send(string $method, string $path, array $data): array
+    {
+        return $this->handle(fn () => $this->client()->{$method}($path, [...$data, 'owner' => $this->owner]));
+    }
+
     private function handle(callable $request): array
     {
         try {