refactor: 重构为三设备架构，zsh 迁移至 fish

- 新增 darwinConfigurations: mac-mini, macbook-air (aarch64-darwin)
- WSL 统一用户名为 imbytecat，主机名改为 awesome-* 系列
- zsh 全面迁移至 fish (abbrs, 内置补全/高亮, zoxide --cmd cd)
- 激活 nix-darwin 模块: Homebrew, 系统偏好, Touch ID sudo
- 移除 bare/standalone 配置及 catppuccin nixosModule from mkDarwin

home/shell/fish.nix

@@ -0,0 +1,63 @@
+{ pkgs, lib, ... }:
+
+{
+  programs.fish = {
+    enable = true;
+
+    shellAbbrs = {
+      # Navigation
+      ".." = "cd ..";
+      "..." = "cd ../..";
+
+      # File listing (eza)
+      ls = "eza --icons --group-directories-first";
+      ll = "eza -la --icons --git --group-directories-first";
+      la = "eza -a --icons --group-directories-first";
+      lt = "eza --tree --level=2 --icons";
+
+      # Tools
+      cat = "bat --paging=never";
+      rm = "trash-put";
+      lg = "lazygit";
+      vi = "nvim";
+
+      # Network
+      http = "xh";
+
+      # Nix
+      update = "nix flake update --flake ~/.config/nix-config";
+    };
+
+    interactiveShellInit = ''
+      # No greeting
+      set -g fish_greeting
+
+      # PATH
+      fish_add_path $HOME/go/bin $HOME/.bun/bin
+
+      # mise
+      mise activate fish | source
+
+      # Sudo: double Escape to prepend sudo (like zsh sudo plugin)
+      bind \e\e 'fish_commandline_prepend sudo'
+
+      # Platform-specific rebuild command
+      if test (uname) = Darwin
+        abbr --add rebuild "darwin-rebuild switch --flake ~/.config/nix-config"
+      else
+        abbr --add rebuild "sudo nixos-rebuild switch --flake ~/.config/nix-config"
+      end
+
+      # WSL clipboard
+      if set -q WSL_DISTRO_NAME
+        alias pbcopy clip.exe
+        alias pbpaste "powershell.exe -noprofile -c Get-Clipboard"
+      end
+
+      # User-local overrides
+      if test -f ~/.config/fish/local.fish
+        source ~/.config/fish/local.fish
+      end
+    '';
+  };
+}