feat(mcp) : add CRUD tools for Sites, Constructeurs, Products

- 5 tools each: list, get, create, update, delete
- McpToolHelper extracted to AbstractApiTestCase for reuse
- DashboardStatsToolTest simplified to use base helpers
- 22 MCP tests pass

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Mcp/Tool/Site/CreateSiteTool.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\Site;
+
+use App\Entity\Site;
+use App\Mcp\Tool\McpToolHelper;
+use Doctrine\ORM\EntityManagerInterface;
+use Mcp\Capability\Attribute\McpTool;
+use Symfony\Bundle\SecurityBundle\Security;
+
+#[McpTool(
+    name: 'create_site',
+    description: 'Create a new industrial site. Requires ROLE_GESTIONNAIRE.',
+)]
+class CreateSiteTool
+{
+    use McpToolHelper;
+
+    public function __construct(
+        private readonly EntityManagerInterface $em,
+        private readonly Security $security,
+    ) {}
+
+    public function __invoke(
+        string $name,
+        string $contactName = '',
+        string $contactPhone = '',
+        string $contactAddress = '',
+        string $contactPostalCode = '',
+        string $contactCity = '',
+        string $color = '',
+    ): array {
+        $this->requireRole($this->security, 'ROLE_GESTIONNAIRE');
+
+        $site = new Site();
+        $site->setName($name);
+        $site->setContactName($contactName);
+        $site->setContactPhone($contactPhone);
+        $site->setContactAddress($contactAddress);
+        $site->setContactPostalCode($contactPostalCode);
+        $site->setContactCity($contactCity);
+        $site->setColor($color);
+
+        $this->em->persist($site);
+        $this->em->flush();
+
+        return $this->jsonResponse([
+            'id'   => $site->getId(),
+            'name' => $site->getName(),
+        ]);
+    }
+}