feat(refactor): WIP refactor server modules

modules/server/services/uptime-kuma/default.nix

@@ -0,0 +1,16 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  unit = "uptime-kuma";
+  cfg = config.server.services.${unit};
+in {
+  config = lib.mkIf cfg.enable {
+    services = {
+      ${unit} = {
+        enable = true;
+      };
+    };
+  };
+}