feat(txt-registry): add apex record delegation check#5864

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u-kai wants to merge 6 commits intokubernetes-sigs:masterfrom

u-kai:feat/check-apex-record

Commits on Sep 23, 2025

refactor: extract normalizeDNSName to idna package for reuse
u-kai
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feat(registry): add apex record delegation check
u-kai
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refactor(registry): improve apex record blocking with clearer naming and documentation
u-kai
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Commits on Sep 24, 2025

feat(registry): fix apex record blocking for nested zones and add comprehensive tests
u-kai
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test(registry): test backward compatibility with pre-existing apex records
u-kai
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Commits on Sep 30, 2025

Merge branch 'master' of https://github.com/kubernetes-sigs/external-dns into feat/check-apex-record
u-kai
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