improve server logging

[samuelcolvin]

Motivation and Context

1. server logging was used using logging parameters
2. repeated dict lookups when checking for membership

How Has This Been Tested?

Tests should cover all cases.

Breaking Changes

No.

Types of changes

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

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context