refactor: unify storage config keys and refresh local dev setup

backend/tests/unit/services/base/test_supabase_service.py

@@ -159,3 +159,15 @@ def test_get_admin_client_lazily_initializes_clients(
     assert service.get_client() is anon_client
     assert service.is_initialized is True
     assert len(create_calls) == 2
+
+
+def test_validate_bucket_accepts_attachment_and_avatar() -> None:
+    service = SupabaseService(
+        settings=SupabaseSettings(public_url="https://test.supabase.co")
+    )
+
+    service._validate_bucket("agent-chat-attachments")
+    service._validate_bucket("avatars")
+
+    with pytest.raises(RuntimeError):
+        service._validate_bucket("unexpected-bucket")