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.

early-init.el

@@ -6,14 +6,13 @@
 
 (setq package-enable-at-startup nil)
 
-(setq inhibit-startup-screen t)		; 禁用开始菜单
+(setq inhibit-startup-screen t)
 (when (fboundp 'tool-bar-mode)
-  (tool-bar-mode -1)			; 禁用工具栏
-  (scroll-bar-mode -1))			; 禁用滚动条
-(menu-bar-mode -1)			; 禁用菜单栏
-(setq display-line-numbers-type '2)
-(setq display-line-numbers-grow-only t)	  ; 行号栏只增不减
-(setq display-line-numbers-width-start 4) ; 预设4位宽度
+  (tool-bar-mode -1)
+  (scroll-bar-mode -1))
+(menu-bar-mode -1)
+
+(prefer-coding-system 'utf-8)
 
 (setq frame-background-mode 'dark)