feat: DNS auto-configuration for Cloudflare, GoDaddy, and Porkbun #4043

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/AlecRae.com/pull/88

Summary

One-click DNS setup for Cloudflare, GoDaddy, and Porkbun — AlecRae pushes all 4 required records (TXT verification, SPF, DKIM CNAME, DMARC) directly to the provider's API, no copy-pasting
Per-record result badges show whether each record was Added / Updated / Already set / Failed
Manual fallback with step-by-step instructions still available below the auto-configure section for providers without API support (Namecheap, Google Domains, Other)
Security: credentials are used in-memory for a single API call and never stored or logged

types.ts — shared AutoConfigRecord/Result types + inferApexDomain() helper
cloudflare.ts — zone lookup by progressive label stripping, upsert per-record (existed/created/updated), proxied=false for DKIM compatibility
godaddy.ts — PUT per-record via GoDaddy API, relative name conversion (@ for apex)
porkbun.ts — retrieve-all-then-create/edit pattern, credentials in POST body
routes/domains.ts — new POST /:id/dns-autoconfig endpoint with Zod discriminated union validation

apps/web/lib/api.ts — domainsApi.autoConfig() + response types
apps/web/app/(dashboard)/domains/page.tsx — DnsSetupWizard rebuilt: auto-configure section at top (credential inputs, "Configure Automatically →" button, result display), manual instructions section below

Add a domain on a Cloudflare-managed zone, enter an API token with Zone:DNS:Edit, click "Configure Automatically" — all 4 records appear in Cloudflare DNS
Repeat for GoDaddy (key + secret) and Porkbun (key + secretApiKey)
Verify that credentials are NOT stored anywhere after the call completes
Confirm that selecting a non-auto provider (Namecheap, Other) shows only the manual instructions
Confirm the "Check Now" footer button still works for manual users
Confirm per-record badges show correct status (created/updated/existed/failed)

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