Support cert auth

[nitzpo]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @nitzpo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant enhancement by adding support for certificate-based authentication to the Lokka MCP server. This new capability allows for more flexible and secure app-only authentication scenarios using PEM-encoded client certificates, expanding the range of deployment options.

Highlights

• New Authentication Method: I've implemented support for certificate-based authentication, leveraging the ClientCertificateCredential from the @azure/identity library. This introduces a new, secure way for app-only authentication.
• Configuration and Usage: New environment variables (CERTIFICATE_PATH, CERTIFICATE_PASSWORD, USE_CERTIFICATE) have been added to configure certificate authentication. The README.md has been updated with clear instructions and an openssl command for converting PFX certificates to PEM format.
• Authentication Mode Enforcement: The application's startup logic now includes a check to ensure that only one authentication mode (Client Provided Token, Interactive, or the new Certificate mode) is enabled at a time, preventing potential configuration conflicts.
• Documentation and Versioning: The README.md has been updated to reflect the new authentication method, re-indexing the existing methods. The project version has also been bumped to 0.2.1 in package.json and package-lock.json.

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[gemini-code-assist]

Code Review

This pull request adds support for certificate-based authentication, a valuable addition to the existing authentication methods. The implementation is well-done, correctly using @azure/identity for the new auth flow and adding validation to prevent misconfiguration with multiple authentication modes enabled. The documentation has also been updated accordingly.

[gemini-code-assist]

To maintain consistency with the package version (0.2.1) and the contributors section, it would be clearer to specify the exact version of the enhancement. The current change from v0.2.0 to v0.2 is a bit ambiguous.

Suggested change

	## Authentication Methods *(Enhanced in v0.2)*
	## Authentication Methods *(Enhanced in v0.2.1)*