feat: add agenix secret for gortium password on uConsole

- Add gortium_password.age entry in secrets.nix
- Add age.secrets.gortium_password in uConsole config
- Add hashedPasswordFile to existing gortium user
- Add ai-worker user for Hermes SSH access

hosts/uconsole-cm5/configuration.nix

@@ -43,3 +43,10 @@
       users.ai-worker.main
     ];
   };
+
+  # Age secret for gortium password
+  age.secrets.gortium_password = {
+    file = ../secrets/gortium_password.age;
+  };
+
+  users.users.gortium.hashedPasswordFile = config.age.secrets.gortium_password.path;