convert to pnpm workspace

packages/playground/server/fn/index.ts

@@ -0,0 +1,11 @@
+// generated by trpc-nuxt
+      import * as trpc from '@trpc/server'
+      
+      export const router = trpc
+        .router()
+        .query('hello', {
+          resolve: () => 'world',
+        });
+      
+      export type Router = typeof router
+