feat: add bun-fullstack agent and update skills

.opencode/skills/tech-stack/elysiajs/integrations/expo.md

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+# Expo Integration
+Run Elysia on Expo (React Native)
+
+## What It Is
+Create API routes in Expo app (SDK 50+, App Router v3).
+
+## Setup
+1. Create `app/[...slugs]+api.ts`
+2. Define Elysia server
+3. Export `Elysia.fetch` as HTTP methods
+
+```typescript
+// app/[...slugs]+api.ts
+import { Elysia, t } from 'elysia'
+
+const app = new Elysia()
+  .get('/', 'hello Expo')
+  .post('/', ({ body }) => body, {
+    body: t.Object({ name: t.String() })
+  })
+
+export const GET = app.fetch
+export const POST = app.fetch
+```
+
+## Prefix for Non-Root
+If placed in `app/api/[...slugs]+api.ts`, set prefix:
+```typescript
+const app = new Elysia({ prefix: '/api' })
+  .get('/', 'Hello Expo')
+
+export const GET = app.fetch
+export const POST = app.fetch
+```
+
+Ensures routing works in any location.
+
+## Eden (End-to-End Type Safety)
+1. Export type:
+```typescript
+// app/[...slugs]+api.ts
+const app = new Elysia()
+  .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/[...slugs]+api'
+
+export const api = treaty<app>('localhost:3000/api')
+```
+
+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>
+}
+```
+
+## Deployment
+- Deploy as normal Elysia app OR
+- Use experimental Expo server runtime
+
+With Expo runtime:
+```bash
+expo export
+# Creates dist/server/_expo/functions/[...slugs]+api.js
+```
+
+Edge function, not normal server (no port allocation).
+
+### Adapters
+- Express
+- Netlify
+- Vercel
+
+## pnpm
+Manual install:
+```bash
+pnpm add @sinclair/typebox openapi-types
+```