init(clanServices): add zerotier boilerplate to clanServices

clanServices/flake-module.nix

@@ -0,0 +1,8 @@
+{ self, lib, ... }:
+{
+  clan.inventory.modules = {
+    zerotier-redux = lib.modules.importApply ./zerotier-redux/default.nix {
+      inherit (self) packages;
+    };
+  };
+}