feat(ui): rebuild homepage with new sections and i18n

This commit introduces a complete overhaul of the homepage, rebuilding it from the ground up with Nuxt UI and full
internationalization support. The new design better showcases the studio's capabilities and projects.

- Re-architected the index page with multiple new sections: Capabilities, Featured Projects, Tech Stack, and Why Choose Us.
- Implemented full i18n for English (en-US) and Chinese (zh-CN) across all new content.
- Centralized the page structure into a `default.vue` layout with a global header (including color mode and locale selectors) and
footer.
- Replaced placeholder logos with a dynamic `UMarquee` of technology icons using Iconify.

nuxt.config.ts

@@ -20,6 +20,15 @@ export default defineNuxtConfig({
     "@nuxtjs/seo",
   ],
   css: ["@/assets/css/main.css"],
+  app: {
+    head: {
+      titleTemplate: "%s - Tootaio Studio",
+      meta: [
+        { name: "viewport", content: "width=device-width, initial-scale=1" },
+        { charset: "utf-8" },
+      ],
+    },
+  },
   i18n: {
     defaultLocale: "en",
     locales: [
@@ -52,4 +61,7 @@ export default defineNuxtConfig({
       twitterImage: DEFAULT_SEO.image,
     },
   },
+  site: {
+    url: "https://tootaio.com",
+  },
 });