refactor: cleanup (deadnix, nixfmt, statix)

hosts/andromache/default.nix

@@ -95,7 +95,7 @@ in
 
   my.yubikey = {
     enable = false;
-    username = config.host.username;
+    inherit (config.host) username;
     keys = [
       {
         handle = "<KeyHandle1>";

hosts/eetion-02/default.nix

@@ -16,7 +16,7 @@
   };
 
   ssh = {
-    username = config.host.username;
+    inherit (config.host) username;
     publicHostname = config.host.name;
     authorizedHosts = [
       "andromache"

hosts/eetion/default.nix

@@ -17,7 +17,7 @@
   };
 
   ssh = {
-    username = config.host.username;
+    inherit (config.host) username;
     publicHostname = config.host.name;
     authorizedHosts = [
       "andromache"

hosts/hecuba/default.nix

@@ -23,7 +23,7 @@
 
   networking.hostName = config.host.name;
   ssh = {
-    username = config.host.username;
+    inherit (config.host) username;
     publicHostname = "server.hektormisplon.xyz";
     authorizedHosts = [
       "andromache"