chore: split oversized file to comply with model size constraints

[minh362000]

Pull Request

Summary

This PR splits a large file into smaller modules to address the model size limit issue and fix UT fail due to size limit module.
No functional logic has been changed; the update focuses purely on restructuring the code.

Type of change

• Feature
• Bug fix
• Docs update
• Chore

Docs Impact (required for any code or docs changes)

• Does this change require docs updates? If yes, list pages:
• Have you updated or added pages under docs/?
• Did you build the site and run the link checker? (python website/build.py + python website/check_links.py)
• Did you avoid banned placeholders? (no "TBD/coming soon")

Testing

Describe how you tested this change. Include commands and results.

Checklist

• Tests pass (pytest -v)
• Linting passes (make lint / make format)
• Documentation updated (if applicable)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bugfix/58

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[thanhbuingoc-cbtw]

LGTM