fix: MangaDex title fallback + image CDN URL

- Title: cascade en → fr → ja-ro → ko-ro → zh-ro → first available to avoid silently dropping mangas without English title (e.g. One Piece stored as ja-ro)
- Image: use uploads.mangadex.org CDN with .512.jpg thumbnail suffix instead of mangadex.org/covers which fails in prod

src/Domain/Manga/Infrastructure/Provider/MangadexProvider.php

@@ -58,7 +58,12 @@ readonly class MangadexProvider implements MangaProviderInterface
     {
         try {
             $attributes = $result['attributes'];
-            $title = $attributes['title']['en'] ?? null;
+            $title = $attributes['title']['en']
+                ?? $attributes['title']['fr']
+                ?? $attributes['title']['ja-ro']
+                ?? $attributes['title']['ko-ro']
+                ?? $attributes['title']['zh-ro']
+                ?? (!empty($attributes['title']) ? reset($attributes['title']) : null);
 
             if (!$title) {
                 return null;
@@ -77,7 +82,7 @@ readonly class MangadexProvider implements MangaProviderInterface
                 }
                 if ($relationship['type'] === 'cover_art') {
                     $imageUrl = sprintf(
-                        'https://mangadex.org/covers/%s/%s',
+                        'https://uploads.mangadex.org/covers/%s/%s.512.jpg',
                         $result['id'],
                         $relationship['attributes']['fileName']
                     );