Refactor app config into modular components

[matdev83]

Summary

• extract configuration helper routines into src/core/config/_app_config_utils.py and import them from app_config.py
• move configuration data model classes into src/core/config/_app_config_models.py
• slim src/core/config/app_config.py by re-exporting the new helpers and models, leaving the AppConfig definition focused on configuration assembly

Testing

• python -m pytest -n0 (fails: ModuleNotFoundError: No module named 'pytest_mock')

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📥 Commits

Reviewing files that changed from the base of the PR and between c03159e and 20f9c0e.

📒 Files selected for processing (2)

• src/core/config/_app_config_models.py (1 hunks)
• src/core/config/_app_config_utils.py (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/refactor-large-monolithic-files-to-smaller-modules-izvmid

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Reintroduce BackendSettings.model_is_functional

AppConfig.model_is_functional now delegates to self.backends.model_is_functional, but the refactor moved BackendSettings to _app_config_models.py without carrying over its model_is_functional method. Because BackendSettings.__getattr__ returns a BackendConfig for unknown attributes, this call now produces a BackendConfig object and raises TypeError: 'BackendConfig' object is not callable. Any code that checks whether a backend/model is functional will crash. Restore the helper on BackendSettings so the method call continues to work.

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