feat: Provisionner automatiquement un nouvel établissement

Lorsqu'un super-admin crée un établissement via l'interface, le système
doit automatiquement créer la base tenant, exécuter les migrations,
créer le premier utilisateur admin et envoyer l'invitation — le tout
de manière asynchrone pour ne pas bloquer la réponse HTTP.

Ce mécanisme rend chaque établissement opérationnel dès sa création
sans intervention manuelle sur l'infrastructure.

backend/tests/Unit/SuperAdmin/Infrastructure/Api/Processor/CreateEstablishmentProcessorTest.php

@@ -7,6 +7,7 @@ namespace App\Tests\Unit\SuperAdmin\Infrastructure\Api\Processor;
 use ApiPlatform\Metadata\Post;
 use App\Shared\Domain\Clock;
 use App\SuperAdmin\Application\Command\CreateEstablishment\CreateEstablishmentHandler;
+use App\SuperAdmin\Application\Command\ProvisionEstablishment\ProvisionEstablishmentCommand;
 use App\SuperAdmin\Domain\Model\SuperAdmin\SuperAdminId;
 use App\SuperAdmin\Infrastructure\Api\Processor\CreateEstablishmentProcessor;
 use App\SuperAdmin\Infrastructure\Api\Resource\EstablishmentResource;
@@ -16,13 +17,15 @@ use DateTimeImmutable;
 use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\MessageBusInterface;
 
 final class CreateEstablishmentProcessorTest extends TestCase
 {
     private const string SUPER_ADMIN_ID = '550e8400-e29b-41d4-a716-446655440001';
 
     #[Test]
-    public function processCreatesEstablishmentAndReturnsResource(): void
+    public function processCreatesEstablishmentAndDispatchesProvisioning(): void
     {
         $repository = new InMemoryEstablishmentRepository();
         $clock = new class implements Clock {
@@ -42,7 +45,16 @@ final class CreateEstablishmentProcessorTest extends TestCase
         $security = $this->createMock(Security::class);
         $security->method('getUser')->willReturn($securityUser);
 
-        $processor = new CreateEstablishmentProcessor($handler, $security);
+        $dispatched = [];
+        $commandBus = $this->createMock(MessageBusInterface::class);
+        $commandBus->method('dispatch')
+            ->willReturnCallback(static function (object $message) use (&$dispatched): Envelope {
+                $dispatched[] = $message;
+
+                return new Envelope($message);
+            });
+
+        $processor = new CreateEstablishmentProcessor($handler, $security, $commandBus);
 
         $input = new EstablishmentResource();
         $input->name = 'École Gamma';
@@ -55,6 +67,12 @@ final class CreateEstablishmentProcessorTest extends TestCase
         self::assertNotNull($result->tenantId);
         self::assertSame('École Gamma', $result->name);
         self::assertSame('ecole-gamma', $result->subdomain);
-        self::assertSame('active', $result->status);
+        self::assertSame('provisioning', $result->status);
+
+        self::assertCount(1, $dispatched);
+        self::assertInstanceOf(ProvisionEstablishmentCommand::class, $dispatched[0]);
+        self::assertSame('admin@ecole-gamma.fr', $dispatched[0]->adminEmail);
+        self::assertSame('ecole-gamma', $dispatched[0]->subdomain);
+        self::assertSame('École Gamma', $dispatched[0]->establishmentName);
     }
 }