fix: Change trainingAnnotations to training_annotations for Python naming convention

[Min-june]

Summary

Fix Python naming convention issue in Model entity

Changes

• Changed trainingAnnotations attribute to training_annotations to follow Python naming convention (snake_case)
• The GraphQL alias remains as trainingAnnotations for API compatibility

Technical Details

Modified Files:

• spb_onprem/models/entities.py

Issue:
The attribute name trainingAnnotations used camelCase instead of Python's snake_case convention, which is inconsistent with other attributes in the Model class.

Backward Compatibility

This change maintains backward compatibility through the Field alias. The GraphQL API continues to use trainingAnnotations while Python code uses the conventional training_annotations.

Testing

• Manual testing required
• Existing tests should pass