This PR refactors authentication throughout the extension to use the Authorization class from @intersystems-community/intersystems-servermanager instead of directly managing username/password strings.

Key changes:

• Replace username/password properties with Authorization type in connection configurations
• Use auth.username and auth.accessToken instead of direct credential access
• Leverage auth.resolve() and auth.httpAuthorizationHeader for authentication checks
• Update REST debug panel and WebSocket terminal to use authorization methods
• Remove isUnauthenticated() helper in favor of auth.resolved() checks
• This improves security by centralizing credential handling through Server Manager's authorization abstraction and prepares the codebase for future OAuth2 support.