fetchAddresses

Retrieves all Relay addresses associated with the current account.

Returns a vector of `RelayAddress` objects on success.

Errors

• RelayApi: Returned for any non-successful (non-2xx) HTTP response. Provides the HTTP status and response body; downstream consumers can inspect these fields. If the response body is JSON with error_code or detail fields, these are parsed and included for more granular handling; otherwise, the raw response text is used as the error detail.

• Network: Returned for transport-level failures, like loss of connectivity, with details in reason.

• Other variants may be returned for unexpected deserialization, URL, or backend errors.