Add isInvitation to BilletOrder, orga details in PDF footer, rename Sortie libre

- Add isInvitation (nullable bool) to BilletOrder: null=no badge, true=invitation
- PDF footer: add SIRET, email, phone of organizer
- PDF: show invitation badge based on ticket.isInvitation instead of design
- Rename "Sortie libre" to "Sortie - Entree illimitee"

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

tests/Entity/BilletOrderTest.php

@@ -21,6 +21,7 @@ class BilletOrderTest extends TestCase
         self::assertSame(0.0, $ticket->getUnitPriceHTDecimal());
         self::assertSame(BilletOrder::STATE_VALID, $ticket->getState());
         self::assertTrue($ticket->isValid());
+        self::assertNull($ticket->isInvitation());
         self::assertNull($ticket->getFirstScannedAt());
         self::assertMatchesRegularExpression('/^ETICKET-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}$/', $ticket->getReference());
         self::assertInstanceOf(\DateTimeImmutable::class, $ticket->getCreatedAt());
@@ -82,6 +83,18 @@ class BilletOrderTest extends TestCase
         self::assertTrue($ticket->isValid());
     }
 
+    public function testSetAndGetIsInvitation(): void
+    {
+        $ticket = new BilletOrder();
+        $result = $ticket->setIsInvitation(true);
+
+        self::assertTrue($ticket->isInvitation());
+        self::assertSame($ticket, $result);
+
+        $ticket->setIsInvitation(null);
+        self::assertNull($ticket->isInvitation());
+    }
+
     public function testSetAndGetFirstScannedAt(): void
     {
         $ticket = new BilletOrder();