Feat: support oauth

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[Copilot]

Pull Request Overview

This PR adds OAuth 2.1 authentication support to AKS-MCP, enabling secure authentication for MCP endpoints using Azure Active Directory as the authorization server. The implementation includes JWT token validation, OAuth metadata endpoints, dynamic client registration, and token introspection capabilities.

Key changes include:

• Integration of OAuth authentication with Azure AD
• Support for both SSE and HTTP Streamable transports
• Comprehensive OAuth endpoint implementation (metadata, token exchange, callback handling)

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
internal/server/server.go	Integrates OAuth components into the main server initialization and endpoint registration
internal/config/config.go	Adds OAuth configuration parsing with environment variable support
internal/config/validator.go	Adds OAuth configuration validation to prevent incompatible settings
internal/auth/types.go	Defines OAuth configuration types and validation logic
internal/auth/oauth/provider.go	Implements Azure AD OAuth provider with JWT validation and metadata handling
internal/auth/oauth/middleware.go	Provides authentication middleware for protecting MCP endpoints
internal/auth/oauth/endpoints.go	Implements OAuth 2.0 endpoints including authorization, token exchange, and callbacks
docs/oauth-authentication.md	Comprehensive documentation for OAuth setup and usage
Test files	Unit tests for OAuth components covering validation, endpoints, and middleware