feat: CreateMangaFromMangadex endpoint + tests, missing image saving

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

@@ -123,4 +123,25 @@ readonly class MangadexProvider implements MangaProviderInterface
             }
         }
     }
+
+    public function findByExternalId(ExternalId $externalId): ?Manga
+    {
+        try {
+            $result = $this->client->getManga($externalId->getValue());
+            
+            if (!isset($result['data'])) {
+                return null;
+            }
+
+            $manga = $this->createMangaFromResult($result['data']);
+            
+            if ($manga) {
+                $this->enrichWithRatings([$manga]);
+            }
+
+            return $manga;
+        } catch (\Exception) {
+            return null;
+        }
+    }
 }