refactor(modules): clean up folder structure

nix/meta.nix

@@ -0,0 +1,39 @@
+{
+  lib,
+  config,
+  inputs,
+  ...
+}:
+let
+  inherit (lib.options) mkOption;
+  inherit (lib.types) path lazyAttrsOf raw;
+  inherit (inputs.flake-parts.lib) mkSubmoduleOptions;
+  inherit (cfg.lib.attrsets) firstAttrNameMatching;
+  cfg = config.flake;
+  username = firstAttrNameMatching (_: v: v.primary or false) cfg.manifest.users;
+in
+{
+  options.flake = mkSubmoduleOptions {
+    lib = mkOption {
+      type = lazyAttrsOf raw;
+      default = { };
+    };
+    paths = {
+      root = mkOption { type = path; };
+      secrets = mkOption {
+        type = path;
+        readOnly = true;
+      };
+    };
+    admin = mkOption {
+      type = lazyAttrsOf raw;
+      default = { };
+    };
+  };
+  config.flake = {
+    paths.secrets = cfg.paths.root + "/secrets";
+    admin = cfg.manifest.users.${username} // {
+      inherit username;
+    };
+  };
+}