feat(client-portal) : phase 3 — ticket notifications

LST-69 (3.2) phase 3. Wires the existing notification system to client-ticket
events (the bell/useNotifications/endpoints already existed).

- Notification.relatedTicket (ManyToOne ClientTicketInterface, SET NULL) +
  additive migration + notification:read group.
- NotifierInterface::notify() gains a backward-compatible optional
  relatedTicket param (existing callers unchanged).
- ClientTicketNumberProcessor (POST): notifies all ROLE_ADMIN users
  (ticket_created), tolerant try/catch after flush. ClientTicketStatusProcessor
  (PATCH): notifies submittedBy on status change (ticket_status_changed).
- Front: notification DTO relatedTicket; NotificationBell navigates to /admin
  (admin) or /portal (client) on ticket notifications.

180 tests green (178 + 2), nuxt build passes, cs-fixer clean.

tests/Functional/Module/ClientPortal/ClientTicketApiTest.php

@@ -6,8 +6,11 @@ namespace App\Tests\Functional\Module\ClientPortal;
 
 use App\Module\ClientPortal\Domain\Entity\ClientTicket;
 use App\Module\ClientPortal\Domain\Enum\ClientTicketStatus;
+use App\Module\ClientPortal\Domain\Enum\ClientTicketType;
+use App\Module\Core\Domain\Entity\Notification;
 use App\Module\Core\Domain\Entity\User;
 use App\Module\ProjectManagement\Domain\Entity\Project;
+use DateTimeImmutable;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\KernelBrowser;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
@@ -123,6 +126,84 @@ final class ClientTicketApiTest extends WebTestCase
         self::assertGreaterThanOrEqual(1, $data['number']);
     }
 
+    public function testCreatingTicketNotifiesAdmins(): void
+    {
+        $client = self::createClient();
+        $em     = self::getContainer()->get(EntityManagerInterface::class);
+
+        $projectIri = $this->sirhProjectIri($em);
+        $this->loginClient($client, 'client-liot');
+
+        $title = 'Notif test '.uniqid('', true);
+        $client->request('POST', '/api/client_tickets', server: [
+            'CONTENT_TYPE' => 'application/ld+json',
+        ], content: json_encode([
+            'type'        => 'other',
+            'title'       => $title,
+            'description' => 'Trigger an admin notification.',
+            'project'     => $projectIri,
+        ]));
+
+        self::assertResponseStatusCodeSame(201);
+        $data     = json_decode($client->getResponse()->getContent(), true);
+        $ticketId = $data['id'];
+
+        $admin = $em->getRepository(User::class)->findOneBy(['username' => 'admin']);
+        self::assertNotNull($admin);
+
+        $notification = $em->getRepository(Notification::class)->findOneBy([
+            'user' => $admin,
+            'type' => 'ticket_created',
+        ], ['createdAt' => 'DESC']);
+
+        self::assertInstanceOf(Notification::class, $notification);
+        self::assertNotNull($notification->getRelatedTicket());
+        self::assertSame($ticketId, $notification->getRelatedTicket()->getId());
+    }
+
+    public function testChangingStatusNotifiesSubmitter(): void
+    {
+        $client = self::createClient();
+        $em     = self::getContainer()->get(EntityManagerInterface::class);
+
+        // Set up a fresh `new` ticket whose submitter is a known client user,
+        // so we can assert the submitter is the notification recipient.
+        $submitter = $em->getRepository(User::class)->findOneBy(['username' => 'client-liot']);
+        self::assertNotNull($submitter);
+        $project = $em->getRepository(Project::class)->findOneBy(['code' => 'SIRH']);
+        self::assertNotNull($project);
+
+        $ticket = new ClientTicket();
+        $ticket->setType(ClientTicketType::Other);
+        $ticket->setTitle('Status notif '.uniqid('', true));
+        $ticket->setDescription('Will be moved to in_progress.');
+        $ticket->setProject($project);
+        $ticket->setSubmittedBy($submitter);
+        $ticket->setStatus(ClientTicketStatus::New);
+        $ticket->setNumber(9000 + random_int(1, 999));
+        $ticket->setCreatedAt(new DateTimeImmutable());
+        $ticket->setUpdatedAt(new DateTimeImmutable());
+        $em->persist($ticket);
+        $em->flush();
+        $ticketId = $ticket->getId();
+
+        // Admin moves it to in_progress.
+        $this->loginClient($client, 'admin');
+        $client->request('PATCH', '/api/client_tickets/'.$ticketId, server: [
+            'CONTENT_TYPE' => 'application/merge-patch+json',
+        ], content: json_encode(['status' => 'in_progress']));
+        self::assertResponseIsSuccessful();
+
+        $notification = $em->getRepository(Notification::class)->findOneBy([
+            'user' => $submitter,
+            'type' => 'ticket_status_changed',
+        ], ['createdAt' => 'DESC']);
+
+        self::assertInstanceOf(Notification::class, $notification);
+        self::assertNotNull($notification->getRelatedTicket());
+        self::assertSame($ticketId, $notification->getRelatedTicket()->getId());
+    }
+
     public function testAdminCannotCreateTicket(): void
     {
         $client = self::createClient();