added output parameter

[rkritika1508]

Summary

Target issue is #PLEASE_TYPE_ISSUE_NUMBER
Explain the motivation for making this change. What existing problem does the pull request solve?

• Output guardrails now receive both the user's original input and the LLM's response when calling the guardrails service. Previously, apply_output_guardrails was passing the LLM output as input_text, which meant validators that evaluate input/output pairs (e.g. answer relevance) couldn't function correctly.
• run_guardrails_validation accepts a new optional output_text parameter that, when provided, is included as "output" in the guardrails service payload — keeping the field absent for input-only validators.
• apply_output_guardrails now accepts input_text and passes the user's original query as input and the LLM response as output in the payload.

Checklist

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• 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.

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