feat(status-pages): set-primary command + verification-friendly add/list/verify

[caballeto]

Summary

Pairs with mono PR #267 (design 042 — status page domains).

• New `status-pages domains set-primary ` command marks an ACTIVE custom domain as the primary host (used as the canonical link target on the public page).
• `add` now prints the right verification record per `verificationMethod` (CNAME → `cname.devhelm.io` for Cloudflare for SaaS, or TXT for the legacy DNS-01 path).
• `list` exposes PRIMARY, SSL, and CNAME TARGET columns so users can see verification + cert state without piping into JSON.
• `verify` prints status + SSL + verification error / expected CNAME.
• Regenerates `api.generated.ts` + `api-zod.generated.ts` from the updated mono spec (adds `cfCustomHostnameId`, `cfSslStatus`, `sslActiveAt`, `primary`).

Test plan

• `npm run lint`
• `npm run typecheck`
• `npm test` (870 passing)
• After mono #267 merges + monitoring-api.json propagates, regenerate from the published spec to confirm no drift.

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