feat(storage): support cloud storage

app/storage/__init__.py

@@ -0,0 +1,13 @@
+from __future__ import annotations
+
+from .aws_s3 import AWSS3StorageService
+from .base import StorageService
+from .cloudflare_r2 import CloudflareR2StorageService
+from .local import LocalStorageService
+
+__all__ = [
+    "AWSS3StorageService",
+    "CloudflareR2StorageService",
+    "LocalStorageService",
+    "StorageService",
+]