refactor: dedup several modules by breaking them out into feature modules

hosts/shared/nixos-server.nix

@@ -1,25 +1,20 @@
 {
   pkgs,
-  inputs,
   ...
 }:
 {
-  boot.loader = {
-    systemd-boot.enable = true;
-    systemd-boot.configurationLimit = 10;
-    efi.canTouchEfiVariables = true;
-    timeout = 0;
-  };
+  imports = [
+    ../../features/bash.nix
+    ../../features/vim.nix
+    ../../features/docker.nix
+    ../../features/libvirt.nix
+    ../../features/avahi.nix
+    ../../features/systemd-boot.nix
+    ../../features/i18n.nix
+    ./nix-package-manager.nix
+  ];
 
-  services = {
-    avahi = {
-      enable = true;
-      nssmdns4 = true;
-      openFirewall = true;
-    };
-
-    openssh.enable = true;
-  };
+  services.openssh.enable = true;
 
   networking = {
     useNetworkd = true;
@@ -68,91 +63,7 @@
     };
   };
 
-  time.timeZone = "America/New_York";
-
-  i18n = {
-    defaultLocale = "en_US.UTF-8";
-
-    extraLocales = [
-      "ja_JP.UTF-8/UTF-8"
-    ];
-
-    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";
-    };
-  };
-
-  programs = {
-    bash = {
-      enable = true;
-
-      interactiveShellInit = ''
-        eval "$(jump shell)"
-        bind -x '"\eOQ": clear;fastfetch'
-      '';
-    };
-
-    starship = {
-      enable = true;
-
-      settings = {
-        character = {
-          success_symbol = "[λ](bold green)";
-          error_symbol = "[λ](bold red)";
-        };
-      };
-    };
-
-    neovim = {
-      enable = true;
-      defaultEditor = true;
-      vimAlias = true;
-
-      configure = {
-        customRC = ''
-          set nocompatible
-          set backspace=indent,eol,start
-          set tabstop=2
-          set shiftwidth=2
-          set expandtab
-        '';
-
-        packages.myPlugins = with pkgs.vimPlugins; {
-          start = [
-            vim-lastplace
-            vim-nix
-          ];
-
-          opt = [ ];
-        };
-      };
-    };
-
-    ssh.startAgent = true;
-  };
-
-  virtualisation = {
-    docker.enable = true;
-    spiceUSBRedirection.enable = true;
-
-    libvirtd = {
-      enable = true;
-
-      qemu = {
-        package = pkgs.qemu_kvm;
-        runAsRoot = true;
-        swtpm.enable = true;
-      };
-    };
-  };
+  programs.ssh.startAgent = true;
 
   users.users.frank = {
     isNormalUser = true;
@@ -174,14 +85,12 @@
       nil
       bash-language-server
       devenv
-      jump
       weather
       borgbackup
       openjdk
       openjdk17
       openjdk25
       tmux
-      fastfetch
       ripgrep
 
       (python3.withPackages (
@@ -196,28 +105,5 @@
     sessionVariables = import ../../features/xdg.nix { inherit pkgs; };
   };
 
-  nix = {
-    gc = {
-      automatic = true;
-      dates = "weekly";
-      options = "--delete-older-than 30d";
-    };
-
-    optimise = {
-      automatic = true;
-      dates = "weekly";
-    };
-
-    settings = {
-      experimental-features = [
-        "nix-command"
-        "flakes"
-      ];
-
-      use-xdg-base-directories = true;
-    };
-  };
-
-  nixpkgs.config.allowUnfree = true;
   system.stateVersion = "26.05";
 }