Replace string search with API call in freeze function

[coderabbitai]

In the function of , the model type is currently determined by searching for a string in . This method is not robust and could lead to errors if the string format changes. It is suggested to replace this string search with a dedicated API call that can more reliably determine the model type.

Affected code:

if '"type": "dpa2"' in model.model_def_script:

This issue was identified in PR #3657 and discussed in the comments: #3657 (comment)