build-inventory: move inventory and inventoryClass into explizitly different folders

lib/modules/inventoryClass/meta-interface.nix

@@ -0,0 +1,35 @@
+{ lib, ... }:
+let
+  types = lib.types;
+
+  metaOptions = {
+    name = lib.mkOption {
+      type = types.strMatching "[a-zA-Z0-9_-]*";
+      example = "my_clan";
+      description = ''
+        Name of the clan.
+
+        Needs to be (globally) unique, as this determines the folder name where the flake gets downloaded to.
+
+        Should only contain alphanumeric characters, `_` and `-`.
+      '';
+    };
+    description = lib.mkOption {
+      default = null;
+      type = types.nullOr types.str;
+      description = ''
+        Optional freeform description
+      '';
+    };
+    icon = lib.mkOption {
+      default = null;
+      type = types.nullOr types.str;
+      description = ''
+        Under construction, will be used for the UI
+      '';
+    };
+  };
+in
+{
+  options = metaOptions;
+}