Config name required in file path causing 400 error

## Description

_A clear description of the bug_
400 error when packing recipe without selecting a config:

<img width="1438" height="761" alt="Image" src="https://github.com/user-attachments/assets/76cec470-d524-4139-9439-18f90c5a93b1" />

## Expected Behavior

_What did you expect to happen instead?_
- config name should be optional in the file path

