hosts: add pn01 and pn02 (ASUS PN51 mini PCs)

Add two ASUS PN51 hosts on VLAN 12 for stability testing.
pn01 at 10.69.12.60, pn02 at 10.69.12.61, both test-tier compute role.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

flake.nix

@@ -200,6 +200,24 @@
             ./hosts/garage01
           ];
         };
+        pn01 = nixpkgs.lib.nixosSystem {
+          inherit system;
+          specialArgs = {
+            inherit inputs self;
+          };
+          modules = commonModules ++ [
+            ./hosts/pn01
+          ];
+        };
+        pn02 = nixpkgs.lib.nixosSystem {
+          inherit system;
+          specialArgs = {
+            inherit inputs self;
+          };
+          modules = commonModules ++ [
+            ./hosts/pn02
+          ];
+        };
       };
       packages = forAllSystems (
         { pkgs }: