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/default.nix

@@ -13,6 +13,7 @@ with lib.metacfg;
     ./acme.nix
     ./nginx.nix
     ./opencode.nix
+    ./rialo.nix
   ];
 
   powerManagement.cpuFreqGovernor = "performance";