refactor(common): modularize common host module

hosts/andromache/meta.nix

@@ -1,8 +1,8 @@
 {
   system = "x86_64-linux";
-  role = "desktop";
   tags = [ "personal" ];
   host = {
+    role = "desktop";
     username = "h";
     highRam = true;
     admin = true;

hosts/astyanax/meta.nix

@@ -1,8 +1,8 @@
 {
   system = "x86_64-linux";
-  role = "laptop";
   tags = [ "personal" ];
   host = {
+    role = "laptop";
     username = "h";
     highRam = true;
     admin = true;

hosts/eetion-02/meta.nix

@@ -1,8 +1,8 @@
 {
   system = "aarch64-linux";
-  role = "embedded";
   tags = [ "lab" ];
   host = {
+    role = "embedded";
     username = "h";
   };
 }

hosts/eetion/meta.nix

@@ -1,8 +1,8 @@
 {
   system = "aarch64-linux";
-  role = "embedded";
   tags = [ "lab" ];
   host = {
+    role = "embedded";
     username = "h";
   };
 }

hosts/hecuba/meta.nix

@@ -1,9 +1,9 @@
 {
   system = "x86_64-linux";
-  role = "server";
   tags = [ "lab" ];
   deploy.autoRollback = true;
   host = {
+    role = "server";
     username = "h";
   };
 }

hosts/vm/meta.nix

@@ -1,8 +1,8 @@
 {
   system = "x86_64-linux";
-  role = "vm";
   tags = [ "lab" ];
   host = {
+    role = "vm";
     username = "h";
   };
 }