perf(web): self-host Font Awesome instead of cdnjs CDN

Replace the external cdnjs.cloudflare.com <link> with a bundled
npm import so FA CSS+fonts ship as static assets through the
same Cloudflare CDN that serves the app — eliminates an extra
DNS lookup and third-party CDN dependency, improves reliability
for China users.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

next-env.d.ts

@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/dev/types/routes.d.ts";
+import "./.next/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.