fix(mcp-auth): remove console.error for expected auth failures

[xiaoyijun]

Summary

Remove the console.error call in handleBearerAuth that logs every authentication failure.

This error logging was noisy in production environments because unauthenticated requests (e.g., users before login) are expected behavior in OAuth flows, not actual errors. The errors are already properly handled and returned as HTTP 401 responses via handleError().

This follows the common practice in frameworks like Express and Koa, where libraries should not print to console directly but let the application layer handle logging.

Testing

N/A

Checklist

• .changeset
• unit tests
• integration tests
• necessary TSDoc comments

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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