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/Product/CreateProductTool.php

@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\Product;
+
+use App\Entity\Product;
+use App\Mcp\Tool\McpToolHelper;
+use App\Repository\ConstructeurRepository;
+use App\Repository\ModelTypeRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Mcp\Capability\Attribute\McpTool;
+use Symfony\Bundle\SecurityBundle\Security;
+
+#[McpTool(
+    name: 'create_product',
+    description: 'Create a new product. supplierPrice must be a string (e.g. "12.50"). Requires ROLE_GESTIONNAIRE.',
+)]
+class CreateProductTool
+{
+    use McpToolHelper;
+
+    public function __construct(
+        private readonly EntityManagerInterface $em,
+        private readonly Security $security,
+        private readonly ModelTypeRepository $modelTypes,
+        private readonly ConstructeurRepository $constructeurs,
+    ) {}
+
+    /**
+     * @param string[] $constructeurIds
+     */
+    public function __invoke(
+        string $name,
+        string $reference = '',
+        string $supplierPrice = '',
+        string $modelTypeId = '',
+        array $constructeurIds = [],
+    ): array {
+        $this->requireRole($this->security, 'ROLE_GESTIONNAIRE');
+
+        $product = new Product();
+        $product->setName($name);
+
+        if ('' !== $reference) {
+            $product->setReference($reference);
+        }
+        if ('' !== $supplierPrice) {
+            $product->setSupplierPrice($supplierPrice);
+        }
+
+        if ('' !== $modelTypeId) {
+            $modelType = $this->modelTypes->find($modelTypeId);
+            if (!$modelType) {
+                $this->mcpError('not_found', "ModelType not found: {$modelTypeId}");
+            }
+            $product->setTypeProduct($modelType);
+        }
+
+        foreach ($constructeurIds as $cId) {
+            $c = $this->constructeurs->find($cId);
+            if (!$c) {
+                $this->mcpError('not_found', "Constructeur not found: {$cId}");
+            }
+            $product->addConstructeur($c);
+        }
+
+        $this->em->persist($product);
+        $this->em->flush();
+
+        return $this->jsonResponse([
+            'id'   => $product->getId(),
+            'name' => $product->getName(),
+        ]);
+    }
+}