chore(config): Refactor Emacs configuration with multiple improvements

- Replace projectile with built-in project.el
- Add cal-china-x for Chinese lunar calendar support
- Add dired-gitignore integration with dirvish
- Add mwim for smarter line navigation
- Add keycast mode for key display
- Add ef-themes theme collection
- Improve corfu terminal handling for Emacs 31+
- Add gptel-agent-project and consult-ripgrep-project helpers
- Remove custom.el from repo, support init-local.el for local config
- Update theme faces for transient, keycast, and calendar holidays
- Various keybinding additions and cleanup

lisp/init-startup.el

@@ -105,9 +105,12 @@
 
 (setq switch-to-buffer-obey-display-actions t)
 
-;; 优化中文混排时的换行规则
+;; 优化换行规则
 (setq word-wrap-by-category t)
 
+;; kill-line删除换行符
+(setq kill-whole-line t)
+
 (provide 'init-startup)
 
 ;;; init-startup.el ends here