Add DoDomain templates (dodomain.io): custom-subdomain-cname and domain-verification

[BSalaeddin]

Hello Domain Connect maintainers,

This PR adds two constrained templates for DoDomain (dodomain.io), a domain-connect-as-a-service API/SDK that SaaS products embed so their end users can attach custom domains.

Templates

• dodomain.io.custom-subdomain-cname.json — one CNAME at the requested host; the only variable is the CNAME target (%target%). hostRequired: true.
• dodomain.io.domain-verification.json — one ownership TXT at the fixed host _dodomain-challenge, value always prefixed dodomain-verify= with txtConflictMatchingMode: Prefix; the only variable is the token.

Signing

Both templates set syncPubKeyDomain: _dckeys.dodomain.io; all synchronous applies are signed (RSA-SHA256, sig last, key present). The public key TXT is already published and resolving at _dck1._dckeys.dodomain.io.

Both set syncBlock: false and syncRedirectDomain: app.dodomain.io. Happy to adjust anything to fit review feedback.

Thank you!

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✅ JSON Filename Check Passed

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Details

Labels to add: Checklist of common problems not complete, PR description incomplete, Test links missing
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PR description check FAILED:
  FAIL  'Type of change' section not found
  FAIL  'How Has This Been Tested?' section not found
  FAIL  'Checklist of common problems' section not found
  FAIL  'Online Editor test results' section not found
  FAIL  Template coverage: dodomain.io.custom-subdomain-cname.json: no editor test link found (expected template id 'dodomain.io.custom-subdomain-cname')
  FAIL  Template coverage: dodomain.io.domain-verification.json: no editor test link found (expected template id 'dodomain.io.domain-verification')

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✅ JSON Schema Validation Passed

[github-actions]

Linter OK

dodomain.io.custom-subdomain-cname.json

Level	Code	Note
info	DCTL1031	all record groupId values are the same

dodomain.io.domain-verification.json

Level	Code	Note
info	DCTL1021	missing from iana definitions
info	DCTL1031	all record groupId values are the same