Format drifted files to satisfy the treefmt flake-check gate

Pure formatting (nixfmt/prettier/yamlfmt); no behavior change. These
files predate the current treefmt config and were failing nix flake
check; reformatting them makes the gate green again.

modules/dns/authoritative.nix

@@ -1,4 +1,9 @@
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 let
   # ZeroTier addresses — zone transfers run over the mesh, not the public net.
   mesh = import ../mesh-hosts.nix { inherit config lib; };