Adds comprehensive support for React Native Expo API Routes, enabling developers to use Hono with Expo Router's file-based API routing system.

What's Added

📦 New Expo Adapter (src/adapter/expo/)

• handle(app) - Returns object with all HTTP method handlers (GET, POST, etc.) that Expo Router expects
• createMethodHandlers(app) - Granular control for selective method export
• handleExpoRequest(app) - Simple single handler function for basic use cases

🚀 Usage Example

// app/api/hello+api.ts
import { Hono } from 'hono'
import { handle } from 'hono/expo'

const app = new Hono()

app.get('/', (c) => {
  return c.json({ message: 'Hello from Hono + Expo!' })
})

app.post('/', async (c) => {
  const body = await c.req.json()
  return c.json({ received: body })
})

// Export the HTTP method handlers that Expo expects
export const { GET, POST } = handle(app)

✨ Key Features

• ✅ All HTTP methods supported (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS)
• ✅ Full Hono middleware compatibility
• ✅ Type-safe with TypeScript
• ✅ Works with all Hono features (routing, validation, etc.)
• ✅ Compatible with Expo Router file-based routing

🧪 Testing & Quality

• 15 comprehensive tests (13 unit + 2 integration tests)
• 100% test coverage for adapter code
• TypeScript compilation verified
• Linting passes
• Integration tests demonstrate real-world usage patterns

📖 Documentation

• Complete README with usage examples
• JSDoc documentation for all functions
• Multiple usage patterns covered

📦 Package Configuration

• Added ./expo export to package.json
• Proper TypeScript definitions included
• Import available as hono/expo

This implementation follows the same patterns as existing adapters (like Vercel) and enables seamless code sharing between Expo projects and APIs while leveraging Hono's powerful feature set.

Fixes #1.

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