Migrate auto-upgrade from clanModule to clanService

clanServices/auto-upgrade/default.nix

@@ -0,0 +1,33 @@
+{ ... }:
+{
+  _class = "clan.service";
+  manifest.name = "clan-core/auto-upgrade";
+  manifest.description = "Automatic system upgrade for the Clan App";
+  manifest.categories = [ "System" ];
+
+  roles.default = {
+    interface =
+      { lib, ... }:
+      {
+        options.flake = lib.mkOption {
+          type = lib.types.str;
+          description = "Flake reference";
+        };
+      };
+
+    perInstance =
+      { settings, ... }:
+      {
+        nixosModule =
+          { ... }:
+          {
+            system.autoUpgrade = {
+              inherit (settings) flake;
+              enable = true;
+              dates = "02:00";
+              randomizedDelaySec = "45min";
+            };
+          };
+      };
+  };
+}

clanServices/auto-upgrade/flake-module.nix

@@ -0,0 +1,6 @@
+{ lib, ... }:
+{
+  clan.modules = {
+    auto-upgrade = lib.modules.importApply ./default.nix { };
+  };
+}