Introduces a custom AccountsAPIError class for consistent error handling and serialization. Adds a new /productvoucher/giftcode route that returns a 404 error response for unimplemented endpoints.
Introduces two new routes: one for serving public keys from the certificates manager at /minecraftservices/publickeys, and another for listing blocked servers from the sessions service at /sessionsserver/blockedservers. These endpoints provide necessary data for authentication and server validation processes.
