refactor: hosts - darwin

hosts/README.md

@@ -1,6 +1,6 @@
 # Hosts
 
-1. macOS
+1. macOS(darwin)
    1. `fern`: MacBook Pro 2022 13-inch M2 16G, mainly for business.
    1. `harmonica`: MacBook Pro 2020 13-inch i5 16G, for personal use.
 2. `idols`

systems/vars.nix

@@ -155,25 +155,25 @@ in {
   # darwin systems
   darwin_harmonica_modules = {
     darwin-modules = [
-      ../hosts/harmonica
+      ../hosts/darwin_harmonica
 
       ../modules/darwin
       ../secrets/darwin.nix
     ];
     home-module.imports = [
-      ../hosts/harmonica/home.nix
+      ../hosts/darwin_harmonica/home.nix
       ../home/darwin
     ];
   };
   darwin_fern_modules = {
     darwin-modules = [
-      ../hosts/fern
+      ../hosts/darwin_fern
 
       ../modules/darwin
       ../secrets/darwin.nix
     ];
     home-module.imports = [
-      ../hosts/fern/home.nix
+      ../hosts/darwin_fern/home.nix
       ../home/darwin
     ];
   };