feat(guardrails): Add header decorator functionality

[Prajna1999]

Issue

Closes #PLEASE_TYPE_ISSUE_NUMBER

Summary

• Before: Existing flow did not have a header decorator for /guardrails.
• Now: The new flow includes a header decorator for the /guardrails endpoint.
• Implemented the header decorator.
• Ensured compatibility with existing guardrail functionalities.

Checklist

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

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

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Original PR description

Issue

Closes #PLEASE_TYPE_ISSUE_NUMBER

Summary

Explain the motivation for making this change. What existing problem does the pull request solve?

Checklist

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

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

Please add here if any other information is required for the reviewer.

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[github-actions]

OpenAPI changes   🟢 16 non-breaking changes

Tip

Safe to merge from an API-contract perspective.

Full changelog  ·  16

	Method	Path	Change
🟢	GET	/api/v1/guardrails	endpoint added
🟢	GET	/api/v1/guardrails/ban_lists	endpoint added
🟢	POST	/api/v1/guardrails/ban_lists	endpoint added
🟢	DELETE	/api/v1/guardrails/ban_lists/{ban_list_id}	endpoint added
🟢	GET	/api/v1/guardrails/ban_lists/{ban_list_id}	endpoint added
🟢	PATCH	/api/v1/guardrails/ban_lists/{ban_list_id}	endpoint added
🟢	GET	/api/v1/guardrails/llm_prompt_configs	endpoint added
🟢	POST	/api/v1/guardrails/llm_prompt_configs	endpoint added
🟢	DELETE	/api/v1/guardrails/llm_prompt_configs/{prompt_config_id}	endpoint added
🟢	GET	/api/v1/guardrails/llm_prompt_configs/{prompt_config_id}	endpoint added
🟢	PATCH	/api/v1/guardrails/llm_prompt_configs/{prompt_config_id}	endpoint added
🟢	GET	/api/v1/guardrails/validators/configs	endpoint added
🟢	POST	/api/v1/guardrails/validators/configs	endpoint added
🟢	DELETE	/api/v1/guardrails/validators/configs/{config_id}	endpoint added
🟢	GET	/api/v1/guardrails/validators/configs/{config_id}	endpoint added
🟢	PATCH	/api/v1/guardrails/validators/configs/{config_id}	endpoint added

_{main ↔ 173381b7 · generated by oasdiff}

[codecov]

Codecov Report

❌ Patch coverage is 92.14876% with 19 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/app/api/routes/guardrails.py	76.00%	18 Missing ⚠️
backend/app/services/llm/guardrails.py	97.77%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!