redirect apex / to /swagger

swagger({ path: '/' }) renders the UI at root but doesn't register the
/json spec route, so the embedded UI loads then 404s on its own spec.
Keep the plugin defaults and bounce / → /swagger instead.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/api.ts

@@ -12,7 +12,8 @@ import { getGatewayContext } from './gateway/context';
 
 const app = new Elysia()
   .use(cors())
-  .use(swagger({ path: '/' }))
+  .use(swagger())
+  .get('/', ({ redirect }) => redirect('/swagger', 302))
   .onError(({ error, set }) => {
     const status = set.status ?? 500;
     const message = (error as Error).message ?? 'Internal error';