Fix agenix-rekey: add real uConsole host key, re-encrypt secrets

- Update uConsole hostPubkey from dummy to real SSH host key
- Add uConsole host key to keys.nix
- Add age.rekey config to lazyworkhorse
- Add SSH host key to identityPaths on both hosts
- Re-encrypt builder_key.age and gortium_password.age for both hosts

hosts/lazyworkhorse/configuration.nix

@@ -251,7 +251,9 @@
   
   # Private host ssh key managed by agenix
   age = {
-    identityPaths = paths.identities;
+    identityPaths = paths.identities ++ [
+      "/etc/ssh/ssh_host_ed25519_key"
+    ];
     secrets = {
       containers_env = {
         file = ../../secrets/containers.env.age;
@@ -585,4 +587,12 @@
     ];
   };
 
-}
+
+  # agenix-rekey configuration (for builder_key re-encryption at build time)
+  age.rekey = {
+    masterIdentities = [
+      "/home/gortium/.ssh/gortium_ssh_key"
+    ];
+  };
+
+}