Add organizer logo upload, Meilisearch organizer search, and webp URL rewriting

VichUploader organizer logo:
- Add organizer_logo mapping with local Flysystem storage
- Add logoFile, logoName, updatedAt fields to User entity
- Use Vich Attribute (not deprecated Annotation)
- Add migration for logo_name and updated_at columns

Meilisearch organizer search:
- Add search bar on /admin/organisateurs page (hides tabs during search)
- Index organizers in Meilisearch on approval
- Sync button on dashboard now syncs both buyers and organizers
- Add tests: search query, search error

Liip Imagine webp:
- Add format filter to all filter_sets for explicit webp conversion
- Add organizer_logo filter_set (400x400, webp)
- Create WebpExtensionSubscriber to rewrite image URLs to .webp extension
- 8 tests for subscriber (png, jpg, jpeg, gif, webp passthrough, case insensitive, null)

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

migrations/Version20260319143558.php

@@ -0,0 +1,33 @@
+<?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 Version20260319143558 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 logo_name VARCHAR(255) DEFAULT NULL');
+        $this->addSql('ALTER TABLE "user" ADD updated_at TIMESTAMP(0) WITHOUT TIME ZONE 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 logo_name');
+        $this->addSql('ALTER TABLE "user" DROP updated_at');
+    }
+}