feat: add bun-fullstack agent and update skills

.agent/skills/tech-stack/elysiajs/integrations/nuxt.md

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+# Nuxt Integration
+
+## What It Is
+Community plugin `nuxt-elysia` for Nuxt API routes with Eden Treaty.
+
+## Installation
+```bash
+bun add elysia @elysiajs/eden
+bun add -d nuxt-elysia
+```
+
+## Setup
+1. Add to Nuxt config:
+```typescript
+export default defineNuxtConfig({
+  modules: ['nuxt-elysia']
+})
+```
+
+2. Create `api.ts` at project root:
+```typescript
+// api.ts
+export default () => new Elysia()
+  .get('/hello', () => ({ message: 'Hello world!' }))
+```
+
+3. Use Eden Treaty:
+```vue
+<template>
+  <div>
+    <p>{{ data.message }}</p>
+  </div>
+</template>
+<script setup lang="ts">
+const { $api } = useNuxtApp()
+
+const { data } = await useAsyncData(async () => {
+  const { data, error } = await $api.hello.get()
+  
+  if (error) throw new Error('Failed to call API')
+  
+  return data
+})
+</script>
+```
+
+Auto-setup on Nuxt API route.
+
+## Prefix
+Default: `/_api`. Customize:
+```typescript
+export default defineNuxtConfig({
+  nuxtElysia: {
+    path: '/api'
+  }
+})
+```
+
+Mounts on `/api` instead of `/_api`.
+
+See [nuxt-elysia](https://github.com/tkesgar/nuxt-elysia) for more config.
+
+## pnpm
+Manual install:
+```bash
+pnpm add @sinclair/typebox openapi-types
+```