refactor(flake): split host guest and module assembly

modules/default.nix

@@ -64,7 +64,6 @@ in
       useUserPackages = true;
       extraSpecialArgs = {
         inherit inputs;
-        my = inputs.self.lib;
       };
       users.${user.name} = {
         home.username = user.name;

modules/network/vlans.nix

@@ -1,14 +1,14 @@
 {
   config,
   lib,
-  my,
+  util,
   ...
 }:
 # The host networking foundation: per-VLAN bridges over a tagged trunk.
 let
   cfg = config.modules.network.vlans;
 
-  inherit (my) bridgeName;
+  inherit (util) bridgeName;
 
   vlanName = id: "${cfg.trunk}.${toString id}";
 in