feat: add bun-fullstack agent and update skills

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

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+
+# Next.js Integration
+
+## What It Is
+Run Elysia on Next.js App Router.
+
+## Setup
+1. Create `app/api/[[...slugs]]/route.ts`
+2. Define Elysia + export handlers:
+```typescript
+// app/api/[[...slugs]]/route.ts
+import { Elysia, t } from 'elysia'
+
+const app = new Elysia({ prefix: '/api' })
+  .get('/', 'Hello Nextjs')
+  .post('/', ({ body }) => body, {
+    body: t.Object({ name: t.String() })
+  })
+
+export const GET = app.fetch
+export const POST = app.fetch
+```
+
+WinterCG compliance - works as normal Next.js API route.
+
+## Prefix for Non-Root
+If placed in `app/user/[[...slugs]]/route.ts`, set prefix:
+```typescript
+const app = new Elysia({ prefix: '/user' })
+  .get('/', 'Hello Nextjs')
+
+export const GET = app.fetch
+export const POST = app.fetch
+```
+
+## Eden (End-to-End Type Safety)
+Isomorphic fetch pattern:
+- Server: Direct calls (no network)
+- Client: Network calls
+
+1. Export type:
+```typescript
+// app/api/[[...slugs]]/route.ts
+export const app = new Elysia({ prefix: '/api' })
+  .get('/', 'Hello Nextjs')
+  .post('/user', ({ body }) => body, {
+    body: treaty.schema('User', { name: 'string' })
+  })
+
+export type app = typeof app
+
+export const GET = app.fetch
+export const POST = app.fetch
+```
+
+2. Create client:
+```typescript
+// lib/eden.ts
+import { treaty } from '@elysiajs/eden'
+import type { app } from '../app/api/[[...slugs]]/route'
+
+export const api =
+  typeof process !== 'undefined'
+    ? treaty(app).api
+    : treaty<typeof app>('localhost:3000').api
+```
+
+Use `typeof process` not `typeof window` (window undefined at build time → hydration error).
+
+3. Use in components:
+```tsx
+// app/page.tsx
+import { api } from '../lib/eden'
+
+export default async function Page() {
+  const message = await api.get()
+  return <h1>Hello, {message}</h1>
+}
+```
+
+Works with server/client components + ISR.
+
+## React Query
+```tsx
+import { useQuery } from '@tanstack/react-query'
+
+function App() {
+  const { data: response } = useQuery({
+    queryKey: ['get'],
+    queryFn: () => getTreaty().get()
+  })
+  
+  return response?.data
+}
+```
+
+Works with all React Query features.
+
+## pnpm
+Manual install:
+```bash
+pnpm add @sinclair/typebox openapi-types
+```