Add per-account dns_resolvers and skip_authoritative_ns_check#31
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In split-horizon DNS setups, lego's authoritative-SOA walk can stop at an internal subdomain that isn't a zone in the configured DNS provider, producing "zone could not be found" errors during DNS-01 validation. Expose two existing lego challenge options through the account API so each account can opt in independently: - dns_resolvers: passed to dns01.AddRecursiveNameservers, overriding the host's resolver for SOA and propagation lookups. - skip_authoritative_ns_check: appends dns01.DisableAuthoritativeNssPropagationRequirement(), skipping the authoritative-NS propagation gate. Both default to the previous behavior; accounts written before this change deserialize with zero values and continue to work unchanged. The dnsResolvers and skipAuthoritativeNSCheck fields already existed on the backend struct but were never populated outside of tests; they are preserved as a test-only path and are now overridden per-account when account-level values are set.
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In split-horizon DNS setups, lego's authoritative-SOA walk can stop at an internal subdomain that isn't a zone in the configured DNS provider, producing "zone could not be found" errors during DNS-01 validation.
Expose two existing lego challenge options through the account API so each account can opt in independently:
Both default to the previous behavior; accounts written before this change deserialize with zero values and continue to work unchanged. The dnsResolvers and skipAuthoritativeNSCheck fields already existed on the backend struct but were never populated outside of tests; they are preserved as a test-only path and are now overridden per-account when account-level values are set.