feat(nix): add HALO system configuration and user setup

- Added system configuration for the HALO machine, including hardware, sound, and remapping settings.
- Configured user-specific settings like session paths, favorite apps, and terminal customization.
- Introduced zram swap, SSD TRIM, and PipeWire priority tuning for performance optimization.

systems/x86_64-linux/halo/default.nix

@@ -0,0 +1,123 @@
+{
+  pkgs,
+  lib,
+  ...
+}:
+with lib;
+with lib.metacfg;
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./xremap.nix
+  ];
+
+  powerManagement.cpuFreqGovernor = "performance";
+
+  services.openssh = {
+    enable = true;
+  };
+
+  services.tailscale.enable = true;
+  services.resolved.enable = true;
+
+  metacfg = {
+    hardware.wooting.enable = true;
+    base.enable = true;
+    gui.enable = true;
+    nix-ld.enable = true;
+    nix.enable = true;
+    podman.enable = true;
+    secureboot.enable = true;
+    homeprinter.enable = true;
+    build.enable = true;
+
+    system = {
+      limits = {
+        enable = true;
+        nofileLimit = 32768;
+        memlockLimit = 32768;
+      };
+    };
+
+    # User configuration
+    tools = {
+      direnv.enable = true;
+    };
+    user.extraGroups = [
+      "docker"
+      "dialout"
+      "tss"
+    ];
+    system.kernelTweaks.enable = true;
+  };
+
+  system.autoUpgrade = {
+    enable = true;
+    operation = "boot";
+    allowReboot = false;
+  };
+
+  nixpkgs.config.permittedInsecurePackages = [
+    "electron-27.3.11"
+  ];
+
+  # Additional kernel tuning beyond the module defaults
+  boot.kernel.sysctl = {
+    # Reduce swap usage (you have zram)
+    "vm.swappiness" = 10;
+    # Prefer keeping directory/inode caches
+    "vm.vfs_cache_pressure" = 50;
+    # Faster dirty page writeback
+    "vm.dirty_ratio" = 10;
+    "vm.dirty_background_ratio" = 5;
+  };
+
+  # SSD TRIM support
+  services.fstrim = {
+    enable = true;
+    interval = "weekly";
+  };
+
+  programs.steam = {
+    enable = true;
+  };
+
+  environment.systemPackages = with pkgs; [
+    attic-client
+    azure-cli
+    claude-code
+    claude-desktop-with-fhs
+    desktop-file-utils
+    gnome-terminal
+    gnome-remote-desktop
+    gtypist
+    k9s
+    klavaro
+    kubectl
+    kubectx
+    logseq
+    nvtopPackages.amd
+    obsidian
+    piper-tts
+    tipp10
+    uv
+    vscode
+    cider-2
+  ];
+
+  # zram swap with zstd compression for better performance
+  zramSwap = {
+    algorithm = "zstd";
+    memoryPercent = 50;
+  };
+
+  services.ratbagd.enable = true;
+
+  virtualisation = {
+    libvirtd.enable = true;
+    docker.enable = true;
+    podman.dockerCompat = false;
+  };
+
+  system.stateVersion = "25.11";
+}