feat(amd): add rialo user with shared home config

Creates a second normal user `rialo` (uid 1001) on the amd system,
member of wheel/docker/dialout/tss and listed in nix.settings.trusted-users
so they can manage the Nix daemon. The home config imports harald@amd
and replicates the bash→fish auto-exec snippet (which lives in the NixOS
user module and only fires for the primary metacfg user).

systems/x86_64-linux/amd/rialo.nix

@@ -0,0 +1,18 @@
+{ pkgs, ... }:
+{
+  users.users.rialo = {
+    isNormalUser = true;
+    home = "/home/rialo";
+    group = "users";
+    shell = pkgs.bash;
+    uid = 1001;
+    extraGroups = [
+      "wheel"
+      "docker"
+      "dialout"
+      "tss"
+    ];
+  };
+
+  nix.settings.trusted-users = [ "rialo" ];
+}