Add Nuxt example application

[2chanhaeng]

Add Nuxt example application

Depends on #675.

Changes

New example: examples/nuxt/

A comprehensive Nuxt example app demonstrating @fedify/nuxt
integration with ActivityPub federation, following the standard
Fedify example architecture.

Features

• Federation: Actor dispatcher, inbox listeners (Follow, Undo),
  object dispatcher for Notes, followers collection, NodeInfo, and
  key pair management via server/federation.ts.
• Vue pages: Home page with post creation, follower/following
  lists, user search, and SSE-powered live updates (pages/index.vue);
  actor profile page (pages/users/[identifier]/index.vue); post
  detail page (pages/users/[identifier]/posts/[id].vue).
• Server API routes: RESTful endpoints under server/api/ for
  home data, posting, follow/unfollow, search, profile lookup, post
  detail, and SSE events.
• Static assets: Fedify logo, demo profile image, CSS stylesheet,
  and dark/light theme toggle script in public/.
• Nuxt config: SSR enabled, @fedify/nuxt module wired with
  federation module path, open host/vite config for tunnel
  compatibility.

@fedify/nuxt bugfix

• Replaced addTemplate() with addServerTemplate() in
  packages/nuxt/src/mod.ts to ensure the generated federation
  middleware module is available in the Nitro server bundle rather
  than only in the client build output.

Test integration

• Added Nuxt example to examples/test-examples/mod.ts with
  pnpm build + pnpm start workflow and 30-second ready timeout.

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Co-Authored-By: Claude Opus 4.6