feat(about): add team member profile page

This commit introduces a new section to showcase team members, starting with the founder's profile.

- Adds a dynamic page route `/about/` to display individual member profiles.
- Creates a new `about` content collection to source profile information from Markdown files.
- Adds the first profile for 'Xiaomai', including a detailed resume and background image.
- Integrates a 'Teams' dropdown into the main navigation header.
- Implements a `copyToClipboard` utility with a toast notification for sharing profile links.

nuxt.config.ts

@@ -13,8 +13,8 @@ export default defineNuxtConfig({
   compatibilityDate: "2025-07-15",
   devtools: { enabled: process.env.NODE_ENV !== "production" },
   modules: [
-    "@nuxt/content",
     "@nuxt/ui",
+    "@nuxt/content",
     "@nuxt/eslint",
     "@nuxtjs/i18n",
     "@nuxtjs/seo",