Anthropic: Add Claude as a model to LLM_CALL

[Prajna1999]

Summary

Target issue is #872
Explain the motivation for making this change. What existing problem does the pull request solve?

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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[sentry]

Codecov Report

❌ Patch coverage is 81.64251% with 38 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/app/services/llm/mappers.py	3.12%	31 Missing ⚠️
backend/app/services/llm/providers/claude.py	89.70%	7 Missing ⚠️

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