Assessment: Add Opus model configuration and enhance enum value handling in schema conversion

[vprashrex]

Issue

Closes#238

Summary

• Add opus model and its configuration in assesmentModel.ts file
• Enhance enum handle fix in response format from assessment module

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran npm run dev and npm run build in the repository root and test.
• If you've fixed a bug or added code that is tested

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