feat : add project code and task auto-numbering

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/State/TaskNumberProcessor.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\Metadata\Post;
+use ApiPlatform\State\ProcessorInterface;
+use App\Entity\Task;
+use App\Repository\TaskRepository;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+
+/**
+ * @implements ProcessorInterface<Task, Task>
+ */
+final readonly class TaskNumberProcessor implements ProcessorInterface
+{
+    /**
+     * @param ProcessorInterface<Task, Task> $persistProcessor
+     */
+    public function __construct(
+        #[Autowire(service: 'api_platform.doctrine.orm.state.persist_processor')]
+        private ProcessorInterface $persistProcessor,
+        private TaskRepository $taskRepository,
+    ) {}
+
+    /**
+     * @param Task $data
+     */
+    public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = []): mixed
+    {
+        if ($operation instanceof Post && null !== $data->getProject()) {
+            $maxNumber = $this->taskRepository->findMaxNumberByProject($data->getProject());
+            $data->setNumber($maxNumber + 1);
+        }
+
+        return $this->persistProcessor->process($data, $operation, $uriVariables, $context);
+    }
+}