feat : MCP server infrastructure setup

Install symfony/mcp-bundle, add STDIO + HTTP transport config,
API token auth on User entity with custom authenticator and firewall,
generate-api-token console command, Nginx /_mcp location, fixture token.

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

src/Command/GenerateApiTokenCommand.php

@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Command;
+
+use App\Repository\UserRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+use function sprintf;
+
+#[AsCommand(
+    name: 'app:generate-api-token',
+    description: 'Generate or regenerate an API token for a user (used for MCP HTTP authentication)',
+)]
+class GenerateApiTokenCommand extends Command
+{
+    public function __construct(
+        private readonly UserRepository $userRepository,
+        private readonly EntityManagerInterface $entityManager,
+    ) {
+        parent::__construct();
+    }
+
+    protected function configure(): void
+    {
+        $this->addArgument('username', InputArgument::REQUIRED, 'The username to generate a token for');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $io       = new SymfonyStyle($input, $output);
+        $username = $input->getArgument('username');
+
+        $user = $this->userRepository->findOneBy(['username' => $username]);
+
+        if (null === $user) {
+            $io->error(sprintf('User "%s" not found.', $username));
+
+            return Command::FAILURE;
+        }
+
+        $token = bin2hex(random_bytes(32));
+        $user->setApiToken($token);
+        $this->entityManager->flush();
+
+        $io->success(sprintf('API token generated for user "%s":', $username));
+        $io->writeln($token);
+
+        return Command::SUCCESS;
+    }
+}