Add SIRET/RNA verification, organizer management, registration flow pages

SIRET/RNA verification:
- Create SiretService with API gouv lookup + JOAFE RNA lookup + cache pool (24h)
- Verification page: declared info vs API data side by side
- Display NAF code + label (from naf.json), nature juridique code + label
- Association/Entreprise/EI badges, ESS badge, RNA, coordonnees lat/long
- JOAFE section: objet, regime, domaine, dates, lieu, PDF download link
- Tranche effectif with readable labels
- Refresh cache button
- Page restricted to non-approved organizers only

Organizer approval flow:
- Approval form with offer (free/basic/custom) and commission rate (default 3%)
- Add commissionRate field to User entity + migration
- Rejection form with required reason textarea, sent in email
- Edit page for approved organizers: all fields modifiable
- Modify button in approved organizers table

Registration flow pages:
- Post-registration success page with email verification message
- Organizer gets additional 48h staff review notice
- Post-email-verification page: confirmed for buyers, 48h notice for organizers

Dashboard:
- Simplified Meilisearch sync to single button

Tests: SiretServiceTest (9), AdminControllerTest (31), RegistrationControllerTest updated, UserTest updated

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

migrations/Version20260319191415.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20260319191415 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE "user" ADD commission_rate DOUBLE PRECISION DEFAULT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE "user" DROP commission_rate');
+    }
+}