Add claude-3-7-sonnet to MODEL_COSTS

[srikar117]

Summary

Adds claude-3-7-sonnet to the MODEL_COSTS dictionary in src/agentdbg/config.py with the pricing.

Changes

• Added claude-3-7-sonnet model to MODEL_COSTS

• Included pricing: $3.00 input and $15.00 output

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Performance improvement
• Code refactoring

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have added tests that prove my fix/feature works
• New and existing tests pass locally
• I have updated documentation if needed
• My changes generate no new warnings

Related Issues

Fixes #7

Screenshots (if applicable)

N/A