Добавлена валидация цены

app/adapters/delivery_providers/base.py

@@ -18,5 +18,9 @@ class DeliveryProvider(ABC):
         raise NotImplementedError
 
 
+class ProviderClientError(RuntimeError):
+    """Raised when a provider call fails for temporary or provider-side reasons."""
+
+
 class ProviderRequestError(RuntimeError):
     """Raised when a provider rejects input request data."""