profile/core: migrate to nixosModule

profiles/core/packages.nix

@@ -0,0 +1,55 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.my.profiles.core.packages;
+in
+{
+  options.my.profiles.core.packages.enable = lib.mkEnableOption "core packages profile";
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      bandwhich # bandwidth monitor
+      bind # dns tools (dig, etc)
+      borgbackup # backup tool
+      cryptsetup # luks volume management
+      delta # git diff viewer
+      fd # find replacement in rust
+      file # show file type
+      fzf # fuzzy finder
+      gettext # localization tools
+      git # version control
+      gptfdisk # disk partitioning tools
+      htop # process monitor
+      jq # json processor
+      killall # kill processes by name
+      lsof # list open files
+      mosh # mobile shell
+      mtr # network diagnostic tool
+      multipath-tools # disk multipathing tools (kpartx)
+      neovim # text editor
+      nmap # network scanner
+      nmon # performance monitor
+      ouch # de-/compression tool
+      pciutils # lspci
+      progress # show progress of coreutils commands
+      pv # pipe viewer
+      reptyr # reparent process to new terminal
+      rsync # remote file sync
+      screen # terminal multiplexer
+      sd # sed replacement
+      stress-ng # stress testing
+      tmux # terminal multiplexer
+      unzip # unzip tools
+      usbutils # lsusb
+      vim # text editor
+      wget # file downloader
+      whois # domain lookup
+      xcp # rust cp replacement
+      zip # zip tools
+    ];
+  };
+}