chore: drop redundant packages and options

- packages.nix is the baseline: drop neovim (nixvim), nvd, sof-firmware (enableAllFirmware), qtmultimedia (v4 leftover); vial moves to vial.nix, wl-clipboard to noctalia.nix, claude-code becomes a plain package here
- drop packages and options already provided elsewhere: noctalia (home-manager), gnupg/pinentry-qt (agent), gtk/qt themes, sddm Theme.Current, zsh plugins (home-manager), group = users, empty firewall lists
- single-package lists without `with pkgs;`, steam package inside its block

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

modules/nixos/vial.nix

@@ -1,26 +1,21 @@
+# Vial keyboards (lily58 pro r2g) expose a raw HID interface that vial.rocks
+# drives over WebHID; its /dev/hidraw* node is root-only by default.
+# The rule ships as 60-vial.rules because uaccess is only applied by
+# 73-seat-late.rules, and services.udev.extraRules lands at 99, too late.
+
 { pkgs, ... }:
 
 {
-  # Vial-capable keyboards (lily58 pro r2g) expose a second, non-keyboard raw
-  # HID interface that vial.rocks drives over WebHID. Its /dev/hidraw* node is
-  # root-only by default, so neither chromium nor the native app can open it.
-  #
-  # This has to ship as a numbered rules file rather than via
-  # services.udev.extraRules: extraRules lands in 99-local.rules, but the
-  # builtin that turns TAG+="uaccess" into an actual ACL is invoked from
-  # systemd's 73-seat-late.rules. A tag set at 99 is set too late to be seen,
-  # so the device ends up correctly tagged and still unreadable. 60- sorts
-  # safely ahead of 73.
   services.udev.packages = [
     (pkgs.writeTextFile {
       name = "vial-udev-rules";
       destination = "/lib/udev/rules.d/60-vial.rules";
-      # Vial firmware advertises itself through a magic USB serial, so this
-      # matches any vial board rather than just the lily58. uaccess hands the
-      # device to whoever owns the active seat, no group membership needed.
+      # the magic serial matches any vial board; uaccess grants the seat owner
       text = ''
         KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{serial}=="*vial:f64c2b3c*", TAG+="uaccess"
       '';
     })
   ];
+
+  environment.systemPackages = [ pkgs.vial ];
 }