Replace deprecated account email with account name in auth status

Summary

The CLI currently enriches auth status (and any future whoami-style output) using the email field of the Account API resource. That field is deprecated as part of dnsimple/dnsimple-business#2318, which removed the notion of an "account email". Once the API stops returning it, our enrichment will silently render a blank label next to the account ID.

We need to switch the CLI to use the account name as the human-readable identifier, once the API exposes it and the Go client is released with the change.

Background

• dnsimple/dnsimple-business#2318 — closed — removed the concept of an account email and introduced a separate "notification email" plus "domain push identifier".
• dnsimple/dnsimple-engineering#425 — open — tracks the corresponding API + API client work. Its acceptance criteria explicitly include:

  Add account name to /whoami, /accounts, /accounts/id

• The motivation for opening this CLI ticket was discussed in dnsimple/dnsimple-engineering#425 (comment): while fixing dnsimple/dnsimple-cli#25 we noticed the SDK still exposes only email and there is no replacement field yet.

Current state

internal/cli/auth.go populates data.AccountEmail from Account.Email via Accounts.ListAccounts. Today the dnsimple-go v8.x Account struct only exposes:

type Account struct {
    ID             int64
    Email          string
    PlanIdentifier string
    CreatedAt      string
    UpdatedAt      string
}

There is no Name field yet, so we cannot make the change in the CLI in isolation.

Dependencies

This ticket is blocked on:

• dnsimple/dnsimple-engineering#425 (API + SDK update)
• A new dnsimple-go release that exposes the new field

References

• dnsimple/dnsimple-engineering#425
• dnsimple/dnsimple-cli#25 (the bug fix that surfaced this gap)

Start in internal/cli/auth.go, where auth status populates data.AccountEmail from Account.Email through Accounts.ListAccounts. Wait for dnsimple-engineering#425 and a dnsimple-go release exposing Account.Name, then update the enrichment and verify that auth status displays the account name instead of the deprecated email.