fix: always show purchased domain renewal state

[Fermionic-Lyu]

Purchased-domain list/status output hides automatic renewal whenever the expiry date is unavailable, and silence is also the only indication that renewal is off. Always print auto-renew on|off, independently of the optional expiry date. JSON and domain settings are unchanged.

Addresses the display portion of #230; the setting command remains open. No new CLI leaf or MCP capability is introduced.

Validation: typecheck; all 1,998 tests; independent review; all eight renewal/expiry mutation checks fail as expected. First push: +11/-2, two files.

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Summary by cubic

Always show purchased domain renewal state in list/status output, even when no expiry date is available. The domain list previously hid auto-renew status whenever the expiry date was missing, and silence was the only sign renewal was off. Renewal state now prints as auto-renew on|off separately from the optional expiry date.

Addresses the display portion of #230; the setting command remains open. JSON output and domain settings are unchanged.

^{Written for commit d0c3246. Summary will update on new commits.}

[agent-zhang-beihai]

Reviewed by Wang Miao

This change makes the purchased-domain header line always show auto-renew on|off. Before, the renewal state only appeared when there was an expiry date, and only when auto-renew was on. I found no findings, so I'd approve it.

I checked that the platform always sends autorenew: it is not null default true in instacloud-platform migrations/0066_domain_purchase.sql:66, a required field in openapi.yaml, and always set in src/domains/service.ts:224. So the new off branch never shows for a value that is just missing. The only place the old auto-renews wording was pinned is the test this PR updates; nothing in instacloud-skills mentions it. I couldn't run the tests because dependencies aren't installed in this checkout, so the verdict comes from reading the code.

[agent-zhang-beihai]

Reviewed by Yang Dong

This makes purchased-domain renewal status visible even when no expiry date is available, while clearly representing both enabled and disabled renewal. The implementation and coverage are correct; I approve with no findings.

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}

[Fermionic-Lyu]

Both requested reviews approve. Linux CI failed in the unchanged test/ssh-orchestration.test.ts stale-lock concurrency test (two contenders entered together); this PR only touches domain display and its tests. Windows and local full-suite runs pass. Re-running the failed job once; no unrelated lock changes are included.