Function cors

cors(options?): Handler
Bun-native CORS middleware compatible with bunWay's router finalizer.
Parameters
- options: CORSOptions = {}
Returns Handler
Example: Allow any localhost origin and forward credentials
```
app.use(cors({ origin: (origin) => origin?.startsWith("http://localhost") ? origin : false, credentials: true }));
```
Example: Simple allow-list
```
app.use(cors({ origin: ["https://app.example.com", /\.my-app\.com$/] }));
```
The middleware inspects the incoming Origin/Access-Control headers, determines whether the request should be allowed, and records all response headers so the router can apply them even if a handler returns a raw Response.
- Defined in src/middlewares/cors.ts:127