Implement reusable upload platform

upload/backend/upload_refs/__init__.py

@@ -0,0 +1,15 @@
+"""Переиспользуемый backend-слой закачки через ВМ."""
+
+from .blueprint import create_upload_refs_blueprint
+from .config import PULL_RETRIES, PULL_RETRY_DELAY, VM_UPLOAD_PREFIX
+from .pull_file import pull_file
+from .safe_name import safe_name
+
+__all__ = [
+    "create_upload_refs_blueprint",
+    "safe_name",
+    "pull_file",
+    "PULL_RETRIES",
+    "PULL_RETRY_DELAY",
+    "VM_UPLOAD_PREFIX",
+]