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>

tests/Entity/UserTest.php

@@ -88,6 +88,33 @@ class UserTest extends TestCase
         self::assertNull($user->getPhone());
     }
 
+    public function testLogoFields(): void
+    {
+        $user = new User();
+
+        self::assertNull($user->getLogoFile());
+        self::assertNull($user->getLogoName());
+        self::assertNull($user->getUpdatedAt());
+
+        $result = $user->setLogoName('logo.png');
+        self::assertSame($user, $result);
+        self::assertSame('logo.png', $user->getLogoName());
+
+        $file = new \Symfony\Component\HttpFoundation\File\File(__FILE__);
+        $result = $user->setLogoFile($file);
+        self::assertSame($user, $result);
+        self::assertSame($file, $user->getLogoFile());
+        self::assertNotNull($user->getUpdatedAt());
+    }
+
+    public function testSetLogoFileNullDoesNotUpdateTimestamp(): void
+    {
+        $user = new User();
+        $user->setLogoFile(null);
+
+        self::assertNull($user->getUpdatedAt());
+    }
+
     public function testResetCodeFields(): void
     {
         $user = new User();