GET /v1/accounts returns {accounts_by_platform, total_accounts} on production today. Schema kept open until the consumers migrate to a flat accounts array.
GET /v1/accounts
{accounts_by_platform, total_accounts}
accounts
@type t() :: %Spatio.Model.AccountListResponse{ accounts: [map()] | nil, accounts_by_platform: %{optional(String.t()) => any()} | nil, total_accounts: integer() | nil }