Save Stripe payment details on order confirmation, add arrive early tip

- Retrieve PaymentIntent on success redirect, save payment_method, card_brand, card_last4
- Display payment info on /ma-commande page (card type + last 4 digits)
- Add "Il est recommande d'arriver en avance" to practical info on ticket PDF
- Migration for payment_method, card_brand, card_last4 columns

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

migrations/Version20260321250000.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260321250000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add payment details to billet_buyer';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE billet_buyer ADD COLUMN IF NOT EXISTS payment_method VARCHAR(50) DEFAULT NULL');
+        $this->addSql('ALTER TABLE billet_buyer ADD COLUMN IF NOT EXISTS card_brand VARCHAR(50) DEFAULT NULL');
+        $this->addSql('ALTER TABLE billet_buyer ADD COLUMN IF NOT EXISTS card_last4 VARCHAR(4) DEFAULT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE billet_buyer DROP COLUMN IF EXISTS payment_method');
+        $this->addSql('ALTER TABLE billet_buyer DROP COLUMN IF EXISTS card_brand');
+        $this->addSql('ALTER TABLE billet_buyer DROP COLUMN IF EXISTS card_last4');
+    }
+}