clanCore: install essential tools for debugging

nixosModules/clanCore/packages.nix

@@ -0,0 +1,10 @@
+{ pkgs, ... }: {
+  # essential debugging tools for networked services
+  environment.systemPackages = [
+    pkgs.dnsutils
+    pkgs.tcpdump
+    pkgs.curl
+    pkgs.jq
+    pkgs.htop
+  ];
+}