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>

hosts/media1/media-desktop.nix

@@ -0,0 +1,114 @@
+{
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  kodiPkg = pkgs.kodi-wayland.withPackages (p: [
+    p.jellycon
+    p.sendtokodi
+    p.inputstream-adaptive
+  ]);
+
+  hyprlandConfig = pkgs.writeText "hyprland.conf" ''
+    # Monitor — auto-detect, native resolution
+    monitor = , preferred, auto, 1
+
+    # Launch Kodi and Firefox on login
+    exec-once = ${lib.getExe' kodiPkg "kodi"}
+    exec-once = ${lib.getExe pkgs.firefox}
+
+    # Workspace rules — Kodi on 1, Firefox on 2
+    windowrulev2 = workspace 1 silent, class:^(kodi)$
+    windowrulev2 = workspace 2 silent, class:^(firefox)$
+    windowrulev2 = fullscreen, class:^(kodi)$
+    windowrulev2 = fullscreen, class:^(firefox)$
+
+    # Start on workspace 1 (Kodi)
+    workspace = 1, default:true
+
+    # Switch workspaces with Super+1/2
+    bind = SUPER, 1, workspace, 1
+    bind = SUPER, 2, workspace, 2
+
+    # No gaps, no borders — TV setup
+    general {
+      gaps_in = 0
+      gaps_out = 0
+      border_size = 0
+    }
+
+    decoration {
+      rounding = 0
+    }
+
+    # Disable animations for snappy switching
+    animations {
+      enabled = false
+    }
+
+    misc {
+      # Disable Hyprland logo/splash
+      disable_hyprland_logo = true
+      disable_splash_rendering = true
+    }
+  '';
+
+  launchHyprland = pkgs.writeShellApplication {
+    name = "launch-hyprland";
+    runtimeInputs = [ pkgs.hyprland ];
+    text = ''
+      export XDG_SESSION_TYPE=wayland
+      exec Hyprland --config ${hyprlandConfig}
+    '';
+  };
+in
+{
+  # Hyprland compositor
+  programs.hyprland.enable = true;
+
+  # greetd for auto-login into Hyprland
+  services.greetd = {
+    enable = true;
+    settings = {
+      default_session = {
+        command = lib.getExe launchHyprland;
+        user = "kodi";
+      };
+    };
+  };
+
+  # Kodi user
+  users.users.kodi = {
+    isNormalUser = true;
+    home = "/home/kodi";
+    group = "kodi";
+    extraGroups = [
+      "video"
+      "audio"
+      "input"
+    ];
+  };
+  users.groups.kodi = { };
+
+  # Packages available on the system
+  environment.systemPackages = [
+    kodiPkg
+    pkgs.firefox
+    pkgs.yt-dlp
+  ];
+
+  # PipeWire for audio (HDMI passthrough support)
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    pulse.enable = true;
+  };
+
+  # Allow VA-API hardware decode in Firefox
+  environment.sessionVariables = {
+    MOZ_ENABLE_WAYLAND = "1";
+    LIBVA_DRIVER_NAME = "iHD";
+  };
+}