refactor: massively overhaul home manager module system

reference/hosts/cassini/configuration.nix

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+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+{
+  pkgs,
+  lib,
+  ...
+}:
+{
+  networking.hostName = "cassini"; # Define your hostname.
+  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
+
+  # Set your time zone.
+  time.timeZone = "America/Los_Angeles";
+
+  # Select internationalisation properties.
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  i18n.extraLocaleSettings = {
+    LC_ADDRESS = "en_US.UTF-8";
+    LC_IDENTIFICATION = "en_US.UTF-8";
+    LC_MEASUREMENT = "en_US.UTF-8";
+    LC_MONETARY = "en_US.UTF-8";
+    LC_NAME = "en_US.UTF-8";
+    LC_NUMERIC = "en_US.UTF-8";
+    LC_PAPER = "en_US.UTF-8";
+    LC_TELEPHONE = "en_US.UTF-8";
+    LC_TIME = "en_US.UTF-8";
+  };
+
+  # Configure keymap in X11
+  services.xserver = {
+    xkb.layout = "us";
+    xkb.variant = "";
+  };
+
+  # Define a user account. Don't forget to set a password with ‘passwd’.
+  users.users.youwen = {
+    isNormalUser = true;
+    description = "Youwen Wu";
+  };
+
+  nix.settings = {
+    trusted-users = [
+      "root"
+      "youwen"
+    ];
+  };
+
+  # Allow unfree packages
+  nixpkgs.config.allowUnfree = true;
+
+  # List packages installed in system profile. To search, run:
+  # $ nix search wget
+  environment.systemPackages = with pkgs; [
+    wget
+    git
+    curl
+  ];
+
+  # Some programs need SUID wrappers, can be configured further or are
+  # started in user sessions.
+  # programs.mtr.enable = true;
+  programs.gnupg.agent = {
+    enable = true;
+    enableSSHSupport = true;
+  };
+
+  programs.dconf.enable = true;
+
+  programs.fish.enable = true;
+  users.users.youwen.shell = pkgs.fish;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "24.05"; # Did you read the comment?
+}

reference/hosts/cassini/default.nix

@@ -0,0 +1,38 @@
+{
+  inputs,
+  ...
+}:
+{
+  imports =
+    [
+      ./configuration.nix
+      ../../modules/linux/core
+      ../../modules/linux/stylix
+      ../../overlays
+      ../../modules/linux/wsl
+      {
+        home-manager.useGlobalPkgs = true;
+        home-manager.useUserPackages = true;
+        home-manager.backupFileExtension = "backup";
+        home-manager.extraSpecialArgs = {
+          inherit inputs;
+        };
+        home-manager.users.youwen = {
+          imports =
+            [
+              ./home-manager-extras
+              ../../users/youwen/common
+              ../../users/youwen/linux/theming
+              ../../users/youwen/linux/home.nix
+              (import ../../users/youwen/common/fastfetch { kitty = false; })
+            ]
+            ++ (with inputs; [
+              nix-index-database.hmModules.nix-index
+            ]);
+        };
+      }
+    ]
+    ++ (with inputs; [
+      home-manager.nixosModules.home-manager
+    ]);
+}

reference/hosts/cassini/hardware-configuration.nix

@@ -0,0 +1,54 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{
+  config,
+  lib,
+  pkgs,
+  modulesPath,
+  ...
+}:
+{
+  imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
+
+  boot.initrd.availableKernelModules = [
+    "nvme"
+    "xhci_pci"
+    "usbhid"
+    "usb_storage"
+    "sd_mod"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/01983a52-5693-4cda-ad2e-5a406776bfb9";
+    fsType = "ext4";
+  };
+
+  boot.initrd.luks.devices."luks-f169a679-d70b-4dff-a344-7131f3303813".device =
+    "/dev/disk/by-uuid/f169a679-d70b-4dff-a344-7131f3303813";
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/3FCB-9D60";
+    fsType = "vfat";
+    options = [
+      "fmask=0022"
+      "dmask=0022"
+    ];
+  };
+
+  swapDevices = [ { device = "/dev/disk/by-uuid/f28d0752-feab-4591-899e-e5deac3712d0"; } ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp4s0f3u2.useDHCP = lib.mkDefault true;
+  # networking.interfaces.wlp2s0.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

reference/hosts/cassini/home-manager-extras/default.nix

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+{ pkgs, ... }:
+{
+}