refactor(waybar): register owned modules

configs/nixos/registry/waybar.nix

@@ -0,0 +1,29 @@
+{ lib, ... }:
+{
+  type = lib.types.submodule {
+    options = {
+      position = lib.mkOption {
+        type = lib.types.enum [
+          "left"
+          "center"
+          "right"
+        ];
+        default = "right";
+        description = "Selects the Waybar section that shows the module.";
+      };
+
+      order = lib.mkOption {
+        type = lib.types.int;
+        default = 100;
+        example = 50;
+        description = "Sorts the module within its Waybar section.";
+      };
+
+      settings = lib.mkOption {
+        type = lib.types.attrsOf lib.types.anything;
+        default = { };
+        description = "Sets the Waybar module configuration.";
+      };
+    };
+  };
+}