feat(storage): support cloud storage

app/storage/cloudflare_r2.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from .aws_s3 import AWSS3StorageService
+
+
+class CloudflareR2StorageService(AWSS3StorageService):
+    def __init__(
+        self,
+        account_id: str,
+        access_key_id: str,
+        secret_access_key: str,
+        bucket_name: str,
+        public_url_base: str | None = None,
+    ):
+        super().__init__(
+            access_key_id=access_key_id,
+            secret_access_key=secret_access_key,
+            bucket_name=bucket_name,
+            public_url_base=public_url_base,
+            region_name="auto",
+        )
+        self.account_id = account_id
+
+    @property
+    def endpoint_url(self) -> str:
+        return f"https://{self.account_id}.r2.cloudflarestorage.com"