Add organizer invitation system: invite, accept, refuse

- OrganizerInvitation entity: companyName, firstName, lastName, email,
  message, status (sent/opened/accepted/refused), unique token (64 hex chars)
- Admin route /admin/organisateurs/inviter: form + invitation list with status
- Button "Inviter un organisateur" on admin organizers page
- Email with accept/refuse links using unique token
- Public route /invitation/{token}/{action}: accept or refuse without auth
- Response page: confirmation message for accept/refuse
- Migration, PHPStan config, 7 entity tests

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

tests/Entity/OrganizerInvitationTest.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace App\Tests\Entity;
+
+use App\Entity\OrganizerInvitation;
+use PHPUnit\Framework\TestCase;
+
+class OrganizerInvitationTest extends TestCase
+{
+    public function testDefaults(): void
+    {
+        $inv = new OrganizerInvitation();
+
+        self::assertNull($inv->getId());
+        self::assertNull($inv->getCompanyName());
+        self::assertNull($inv->getFirstName());
+        self::assertNull($inv->getLastName());
+        self::assertNull($inv->getEmail());
+        self::assertNull($inv->getMessage());
+        self::assertSame(OrganizerInvitation::STATUS_SENT, $inv->getStatus());
+        self::assertSame(64, \strlen($inv->getToken()));
+        self::assertNull($inv->getRespondedAt());
+        self::assertInstanceOf(\DateTimeImmutable::class, $inv->getCreatedAt());
+    }
+
+    public function testSetAndGetCompanyName(): void
+    {
+        $inv = new OrganizerInvitation();
+        $result = $inv->setCompanyName('Asso Test');
+
+        self::assertSame('Asso Test', $inv->getCompanyName());
+        self::assertSame($inv, $result);
+    }
+
+    public function testSetAndGetNames(): void
+    {
+        $inv = new OrganizerInvitation();
+        $inv->setFirstName('Jean');
+        $inv->setLastName('Dupont');
+        $inv->setEmail('jean@test.fr');
+
+        self::assertSame('Jean', $inv->getFirstName());
+        self::assertSame('Dupont', $inv->getLastName());
+        self::assertSame('jean@test.fr', $inv->getEmail());
+    }
+
+    public function testSetAndGetMessage(): void
+    {
+        $inv = new OrganizerInvitation();
+        $result = $inv->setMessage('Bienvenue !');
+
+        self::assertSame('Bienvenue !', $inv->getMessage());
+        self::assertSame($inv, $result);
+
+        $inv->setMessage(null);
+        self::assertNull($inv->getMessage());
+    }
+
+    public function testSetAndGetStatus(): void
+    {
+        $inv = new OrganizerInvitation();
+        $result = $inv->setStatus(OrganizerInvitation::STATUS_ACCEPTED);
+
+        self::assertSame(OrganizerInvitation::STATUS_ACCEPTED, $inv->getStatus());
+        self::assertSame($inv, $result);
+    }
+
+    public function testSetAndGetRespondedAt(): void
+    {
+        $inv = new OrganizerInvitation();
+        $date = new \DateTimeImmutable();
+        $result = $inv->setRespondedAt($date);
+
+        self::assertSame($date, $inv->getRespondedAt());
+        self::assertSame($inv, $result);
+    }
+
+    public function testUniqueTokens(): void
+    {
+        $inv1 = new OrganizerInvitation();
+        $inv2 = new OrganizerInvitation();
+
+        self::assertNotSame($inv1->getToken(), $inv2->getToken());
+    }
+}