refactor: Reorganize config with use-package and optimize startup hooks

- Split monolithic init-package.el into focused modules
- Convert eager `:init` blocks to lazy `:hook`
- Consolidate UI settings and defer theme loading.
- Remove duplicated config between GUI and terminal paths.

lisp/init-terminal-ui.el

@@ -4,18 +4,6 @@
 
 ;;; Code:
 
-;; 设置系统编码
-(when (fboundp 'set-charset-priority)
-  (set-charset-priority 'unicode))
-
-(if *is-windows*
-    (progn
-      (set-language-environment 'chinese-gbk)
-      (prefer-coding-system 'utf-8-auto))
-  (progn
-    (set-language-environment "UTF-8")
-    (prefer-coding-system 'utf-8)))
-
 ;; 显示文件大小
 (size-indication-mode t)