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

astro.config.mjs

@@ -9,6 +9,15 @@ export default defineConfig({
   vite: {
       plugins: [tailwindcss()],
   },
-
+  i18n: {
+    // The default locale to fall back to if a page isn't available in the active locale
+    defaultLocale: "en",
+    // A list of all locales supported by the site
+    locales: ["en", "zh"],
+    routing: {
+      // URLs for the defaultLocale (en) will not have a /en/ prefix
+      prefixDefaultLocale: false,
+    }
+  },
   integrations: [react()]
 });