fix(dns): handle split DKIM TXT records + correct smoke test curl #4045

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/AlecRae.com/pull/86

Summary

• fix(dns): verifyDKIM only used the first 255-char chunk of a multi-chunk TXT record returned by Porkbun, so 2048-bit RSA keys were always truncated and never matched the stored key. Fix: join all TXT entries before searching for v=DKIM1 so the full key is assembled regardless of how the provider splits it.
• fix(docs): vapron-migration-type2.md Step 8 smoke test used "from": "string" and "to": "string" — the API's SendMessageSchema requires "from": {email, name} and "to": [{email}]. Also corrected the endpoint path (/v1/messages/send) and expected response shape.

Test plan

• DNS service: 13 auto-config tests pass (bun x vitest run services/dns)
• Re-run POST /v1/domains/:id/verify on mail.vapron.ai — DKIM should flip to verified: true
• Run smoke test with corrected curl — expect {"status":"queued"} and email delivery

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