feat(i18n): 添加导航菜单多语言支持并调整头部样式

- 在en.json和zh.json中添加导航菜单和品牌名称的翻译
- 修改ArcticNewOneHeader组件使用vue-i18n实现多语言切换
- 调整导航菜单的间距和字体大小

i18n/locales/en.json

@@ -1,8 +1,16 @@
 {
   "app": {
     "name": "ArcticNewOne",
+    "brand": "ArcticNewOne",
     "description": "Explore infinite possibilities and modern experiences. Welcome to ArcticNewOne."
   },
+  "nav": {
+    "home": "Home",
+    "studio": "Studio",
+    "work": "Work",
+    "news": "News",
+    "contact": "Contact"
+  },
   "home": {
     "title": "Home",
     "welcome": "Welcome to Arctic New One"