refactor: 重构为多平台多用户架构，全面提升终端体验

- 新增 lib/ 辅助函数（mkNixos/mkDarwin/mkHome），消除硬编码
- 拆分 modules/ 为 nixos/darwin/shared 三层，支持跨平台共享
- 重构 home/ 为 shell/dev/theme 子模块，工具全部迁入用户级
- 深度配置 Tmux/FZF/Atuin/Bat/Eza/Btop/Lazygit/Starship
- 添加 Catppuccin Mocha 统一主题、Nerd Fonts 声明式管理
- 新增 homeConfigurations 输出，支持非 NixOS 系统直装
- 新增 nix-darwin 输入，预留 macOS 扩展路径
- 新增 overlays/ 和 pkgs/ 自定义包基础设施
- 修正 nix-darwin URL（LnL7 → nix-darwin org）

modules/base.nix

@@ -1,49 +0,0 @@
-{ config, pkgs, ... }:
-
-{
-  environment.systemPackages = with pkgs; [
-    # ── 核心工具 ──
-    curl
-    git
-    micro
-    vim
-    wget
-
-    # ── 现代 CLI 替代 ──
-    bat # cat
-    btop # top
-    duf # df
-    dust # du
-    eza # ls
-    fd # find
-    jq # JSON
-    procs # ps
-    ripgrep # grep
-    sd # sed
-    xh # curl/httpie
-    yq # YAML
-
-    # ── 文件管理 ──
-    trash-cli
-    yazi
-
-    # ── 系统信息 ──
-    fastfetch
-    tealdeer # tldr
-  ];
-
-  # ── Nix 设置 ──
-  nix.settings = {
-    experimental-features = [
-      "nix-command"
-      "flakes"
-    ];
-    # 国内镜像（按需取消注释）
-    # substituters = [
-    #   "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"
-    #   "https://cache.nixos.org"
-    # ];
-  };
-
-  nixpkgs.config.allowUnfree = true;
-}

modules/darwin/default.nix

@@ -0,0 +1,46 @@
+{ pkgs, username, ... }:
+
+{
+  # ── Shell ──────────────────────────────────────────
+  programs.zsh.enable = true;
+
+  # ── User ───────────────────────────────────────────
+  users.users.${username} = {
+    home = "/Users/${username}";
+    shell = pkgs.zsh;
+  };
+
+  # ── Fonts ──────────────────────────────────────────
+  fonts.packages = with pkgs; [
+    maple-mono.NF-CN-unhinted
+    nerd-fonts.symbols-only
+  ];
+
+  # ── macOS system preferences ───────────────────────
+  system.defaults = {
+    dock = {
+      autohide = true;
+      show-recents = false;
+      mru-spaces = false;
+    };
+    finder = {
+      AppleShowAllExtensions = true;
+      FXPreferredViewStyle = "clmv";
+    };
+    NSGlobalDomain = {
+      AppleShowAllExtensions = true;
+      InitialKeyRepeat = 15;
+      KeyRepeat = 2;
+    };
+  };
+
+  # ── Homebrew (GUI apps not in nixpkgs) ─────────────
+  # homebrew = {
+  #   enable = true;
+  #   casks = [
+  #     "raycast"
+  #     "arc"
+  #   ];
+  #   onActivation.cleanup = "zap";
+  # };
+}

modules/dev.nix

@@ -1,54 +0,0 @@
-{ config, pkgs, ... }:
-
-{
-  environment.systemPackages = with pkgs; [
-    # ── 语言运行时 ──
-    bun
-    go
-    nodejs
-
-    # ── 包管理 / 版本管理 ──
-    mise
-    uv
-
-    # ── 编辑器 ──
-    neovim
-
-    # ── 终端复用 ──
-    tmux
-    zellij
-
-    # ── Git 增强 ──
-    delta # Arch 包名: git-delta
-    gh # Arch 包名: github-cli
-    lazygit
-
-    # ── Linter / Formatter ──
-    biome
-    ruff
-    shellcheck
-    shfmt
-
-    # ── LSP 服务器 ──
-    ast-grep
-    bash-language-server
-    gopls
-    typescript-language-server # 若报错尝试 nodePackages.typescript-language-server
-    yaml-language-server # 若报错尝试 nodePackages.yaml-language-server
-    vue-language-server # 替代原 bun -g @vue/language-server
-    dockerfile-language-server-nodejs # 替代原 bun -g dockerfile-language-server
-
-    # ── 原 bun/go 全局安装的工具 ──
-    # 以下工具如果在 nixpkgs 中不存在，需要自定义打包：
-    #
-    # opencode-ai:
-    #   buildNpmPackage { pname = "opencode-ai"; ... }
-    #
-    # go-claude-code-comment-checker:
-    #   buildGoModule {
-    #     pname = "comment-checker";
-    #     src = fetchFromGitHub { owner = "code-yeongyu"; repo = "..."; ... };
-    #     vendorHash = "sha256-...";
-    #   }
-  ];
-}

modules/nixos/base.nix

@@ -0,0 +1,18 @@
+{ pkgs, ... }:
+
+{
+  # ── System-essential packages ──────────────────────
+  # User-level tools live in home-manager (home/)
+  environment.systemPackages = with pkgs; [
+    curl
+    git
+    vim
+    wget
+  ];
+
+  # ── Fonts ──────────────────────────────────────────
+  fonts.packages = with pkgs; [
+    maple-mono.NF-CN-unhinted
+    nerd-fonts.symbols-only
+  ];
+}

modules/nixos/default.nix

@@ -0,0 +1,22 @@
+{ pkgs, username, ... }:
+
+{
+  imports = [
+    ./base.nix
+    ./docker.nix
+    ./locale.nix
+  ];
+
+  # ── Default shell ──────────────────────────────────
+  programs.zsh.enable = true;
+
+  # ── Default user ───────────────────────────────────
+  users.users.${username} = {
+    isNormalUser = true;
+    shell = pkgs.zsh;
+    extraGroups = [ "wheel" ];
+  };
+
+  # ── sudo ───────────────────────────────────────────
+  security.sudo.wheelNeedsPassword = false;
+}

modules/nixos/docker.nix

@@ -1,16 +1,14 @@
-{ config, pkgs, ... }:
+{ pkgs, username, ... }:
 
 {
-  virtualisation.docker = {
-    enable = true;
-  };
+  virtualisation.docker.enable = true;
+
+  users.users.${username}.extraGroups = [ "docker" ];
 
   environment.systemPackages = with pkgs; [
     docker-compose
   ];
 
-  # 注：用户 docker 组权限在 hosts/*/default.nix 中配置
-  #
   # WSL 环境下如使用 Docker Desktop，可改为：
   #   wsl.docker-desktop.enable = true;
   # 并将上面的 virtualisation.docker.enable 设为 false

modules/nixos/locale.nix

@@ -1,8 +1,10 @@
-{ config, ... }:
+{ ... }:
 
 {
   i18n = {
     defaultLocale = "en_US.UTF-8";
     supportedLocales = [ "en_US.UTF-8/UTF-8" ];
   };
+
+  time.timeZone = "Asia/Shanghai";
 }

modules/shared/default.nix

@@ -0,0 +1,3 @@
+{
+  imports = [ ./nix.nix ];
+}

modules/shared/nix.nix

@@ -0,0 +1,18 @@
+{ lib, ... }:
+
+{
+  nix.settings = {
+    experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+    warn-dirty = false;
+    # 国内镜像（按需取消注释）
+    # substituters = [
+    #   "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"
+    #   "https://cache.nixos.org"
+    # ];
+  };
+
+  nixpkgs.config.allowUnfree = true;
+}

modules/shell.nix

@@ -1,6 +0,0 @@
-{ config, pkgs, ... }:
-
-{
-  # 系统级启用 Zsh（用户级配置在 home/shell.nix）
-  programs.zsh.enable = true;
-}