feat(i18n): implement astro i18n integration and refactor locale handling

- Add i18n configuration to astro.config.mjs with default locale and routing
- Refactor language handling to use Astro.currentLocale instead of URL parsing
- Update tsconfig to include only necessary files for better type checking
- Improve LanguageSwitcher to handle routing based on astro i18n config
- Add new translation keys and update components to use dynamic titles
- Simplify MotionWrapper component by removing unused default animations

src/i18n/ui.ts

@@ -16,6 +16,7 @@ export const ui = {
     'nav.education': 'Education',
     'footer.rights': 'All rights reserved.',
     'site.title': 'My Portfolio',
+    'page.home.title': 'Home',
 
     // Personal Info
     'personal.name': 'Rishikesh S',
@@ -158,6 +159,7 @@ export const ui = {
     'nav.education': '教育背景',
     'footer.rights': '版权所有。',
     'site.title': '我的作品集',
+    'page.home.title': '首页',
 
     // Personal Info
     'personal.name': 'Rishikesh S',