// Package auth provides authentication functionality for various AI service providers.// It includes interfaces and implementations for token storage and authentication methods.package auth // TokenStorage defines the interface for storing authentication tokens.// Implementations of this interface should provide methods to persist// authentication tokens to a file system location.type TokenStorage interface {	// SaveTokenToFile persists authentication tokens to the specified file path.	//	// Parameters:	//   - authFilePath: The file path where the authentication tokens should be saved	//	// Returns:	//   - error: An error if the save operation fails, nil otherwise	SaveTokenToFile(authFilePath string) error}