feat(nixos): add Bambu Studio Flatpak

Manage the user Flatpak through nix-flatpak and enable printer discovery through the host firewall.

configs/nixos/modules/desktop/apps/bambu-studio.nix

@@ -0,0 +1,36 @@
+{
+  config,
+  inputs,
+  lib,
+  util,
+  ...
+}:
+# Bambu Studio for preparing and monitoring Bambu Lab prints.
+let
+  user = config.user.name;
+in
+{
+  options.modules.desktop.apps.bambu-studio.enable =
+    lib.mkEnableOption "Bambu Studio for preparing and monitoring Bambu Lab prints";
+
+  config = lib.mkIf config.modules.desktop.apps.bambu-studio.enable {
+    services.flatpak.enable = true;
+
+    home-manager.sharedModules = [ inputs.nix-flatpak.homeManagerModules.nix-flatpak ];
+    home-manager.users.${user}.services.flatpak = {
+      enable = true;
+      packages = [ "com.bambulab.BambuStudio" ];
+    };
+
+    # Bambu printers announce themselves with SSDP multicast or broadcast traffic.
+    networking.firewall.allowedUDPPorts = [
+      1990
+      2021
+    ];
+
+    registry.window-icon.${config.networking.hostName}.bambu-studio = {
+      class = "[Bb]ambu[Ss]tudio";
+      icon = util.glyph "f1b2";
+    };
+  };
+}