dns: add libdns provider registry

Curated cloudflare, gigahost, hetzner, powerdns and rfc2136.
Settings decode via json tags; env per field, <field>_path for secrets.

Updates #2137

go.sum

@@ -259,12 +259,16 @@ github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674 h1:JeSE6pjso5T
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@@ -311,12 +315,27 @@ github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
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@@ -340,6 +359,8 @@ github.com/miekg/dns v1.1.73 h1:uhT8nJxmTrPJYClxVxTCX+CVn6qnzSiybRk72Z6DgrE=
 github.com/miekg/dns v1.1.73/go.mod h1:RW2Obtfd5NZHvOFe3zYG0W8koWOQtAzyHaLo8vASBuQ=
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+github.com/mittwald/go-powerdns v0.6.6 h1:yQcuszhl98+jJgELjD5ecfxCQWoshhnArexpwrwQxLY=
+github.com/mittwald/go-powerdns v0.6.6/go.mod h1:adWJ860laOgm14afg+7V0nCa5NQT37oEYe2HRhoS/CA=
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@@ -358,6 +379,7 @@ github.com/morikuni/aec v1.1.0 h1:vBBl0pUnvi/Je71dsRrhMBtreIqNMYErSAbEeb8jrXQ=
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@@ -627,6 +649,8 @@ google.golang.org/protobuf v1.36.12/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j
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