Security: Remove Litellm

[AkhileshNegi]

• Removed direct litellm import from app/services/llm/mappers.py; replaced litellm.supports_reasoning() with a lookup against a new OPENAI_REASONING_MODELS constant in app/models/llm/constants.py. Will move to DB soon in coming PR Model Config: Add model configuration table and API endpoints #669
• Pinned litellm==1.82.1 in pyproject.toml via [tool.uv] override-dependencies to block auto-upgrade to the compromised 1.82.7/1.82. releases (March 2026 supply chain attack).

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Run ID: 25d5a861-f0e5-46a2-846d-6d396858d8f6

📥 Commits

Reviewing files that changed from the base of the PR and between c73704e and bc81773.

⛔ Files ignored due to path filters (1)

• backend/uv.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• backend/app/models/llm/constants.py
• backend/app/services/llm/mappers.py
• backend/pyproject.toml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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