fix: add missing 1 credit for boltzgen

[amandazhuyilan]

Pull Request

Summary

Add in missing boltzgen credit information in credits.py needed for credit calculation in the workflow submission form.

Changes

• Add missing de-novo-design → {"bindcraft": 20, "rfdiffusion": 10, "boltzgen": 1}
• Updated tests

How to Test

Tests in CI shall pass

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added or updated documentation where necessary
• I have run linting and unit tests locally
• The code follows the project's style guidelines