add download service

backend/app/openings_downloader/services/__init__.py

@@ -0,0 +1,12 @@
+# Services for Openings Downloader
+from .shikimori import ShikimoriService
+from .animethemes import AnimeThemesService
+from .downloader import DownloadService
+from .storage_tracker import StorageTrackerService
+
+__all__ = [
+    "ShikimoriService",
+    "AnimeThemesService",
+    "DownloadService",
+    "StorageTrackerService",
+]