feat: nb add flatpak iptv package

hosts/nb/modules/desktop/flatpak-packages.nix

@@ -0,0 +1,30 @@
+{ pkgs, ... }: {
+  services.flatpak.enable = true;
+  systemd.services.flatpak-repo = {
+    wantedBy = [ "multi-user.target" ];
+    path = [ pkgs.flatpak ];
+    script = ''
+      ${pkgs.flatpak}/bin/flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+    '';
+  };
+
+  systemd.services.flatpak-install-packages = {
+    wants = [ "flatpak-repo.service" ];
+    wantedBy = [ "multi-user.target" ];
+    path = [ pkgs.flatpak ];
+    script = ''
+      ${pkgs.flatpak}/bin/flatpak install -y https://dl.flathub.org/repo/appstream/io.github.yuki_iptv.yuki-iptv.flatpakref
+    '';
+  };
+
+  environment.systemPackages = [
+    (pkgs.makeDesktopItem {
+      name = "yuki-iptv";
+      desktopName = "Yuki IPTV";
+      genericName  = "IPTV Player";
+      exec         = "${pkgs.flatpak}/bin/flatpak run io.github.yuki_iptv.yuki-iptv";
+      terminal     = false;
+      categories   = [ "Multimedia" ];
+    })
+  ];
+}