media1: add NixOS media PC configuration

GMKtec G3 (Intel N100) replacing the old Ubuntu media PC on VLAN 31.
Hyprland compositor with Kodi on workspace 1 and Firefox on workspace 2,
greetd auto-login, PipeWire audio, VA-API hardware decode, and NFS
mount for media from NAS.

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

flake.nix

@@ -236,6 +236,15 @@
             ./hosts/nrec-nixos02
           ];
         };
+        media1 = nixpkgs.lib.nixosSystem {
+          inherit system;
+          specialArgs = {
+            inherit inputs self;
+          };
+          modules = commonModules ++ [
+            ./hosts/media1
+          ];
+        };
         openstack-template = nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {