refactor: Use haumea for filesystem-based module system for flake outputs

refactor: Use hyphen(`-`) for variable names & folder names(except Python), replace all unserscore(`_`) with hyphen(`-`).

modules/darwin/security.nix

@@ -1,9 +1,9 @@
 {
   config,
-  username,
+  myvars,
   ...
 }: let
-  homeDir = config.users.users."${username}".home;
+  homeDir = config.users.users."${myvars.username}".home;
 in {
   # https://github.com/LnL7/nix-darwin/blob/master/modules/programs/gnupg.nix
   # try `pkill gpg-agent` if you have issues(such as `no pinentry`)