类型别名：AuthServerSuccessCode

type AuthServerSuccessCode = 
  | "server_metadata_valid"
  | "dynamic_registration_supported"
  | "pkce_supported"
  | "s256_code_challenge_method_supported"
  | "authorization_code_grant_supported"
  | "code_response_type_supported";

授权服务器元数据验证成功的代码。