style(config): Reformat Emacs Lisp code for consistency

Standardize formatting across multiple init files: expand
single-line use-package keywords onto separate lines, fix
indentation, remove outdated comments, and clean up whitespace. Also
adds mc/keymap <return> binding and improves fcitx5 startup logic in
EXWM.

lisp/init-segmentation.el

@@ -36,12 +36,15 @@
 ;; 其他配置
 (setq cns-recent-segmentation-limit 40)
 (require 'cns nil t)
+
 ;; 自动启动
 (when (featurep 'cns)
   (add-hook 'find-file-hook 'global-cns-mode))
+
 ;; 取消C-<backspace>绑定
 (with-eval-after-load 'cns
   (define-key cns-mode-map (kbd "C-<backspace>") nil))
+
 ;; vterm下关闭cns-mode
 (add-hook 'vterm-mode-hook
           (lambda ()