Revert "removed cors"

This reverts commit 8854022fac.

src/app.ts

@@ -2,6 +2,7 @@ import { createContext, router } from "./trpc";
 import { createHTTPServer } from "@trpc/server/adapters/standalone";
 import { userRoute } from "./userRoute";
 import { runPlayground } from "./playgroud";
+import cors from "cors";
 import { infoRoute } from "./infoRoute";
 
 export const appRouter = router({
@@ -14,6 +15,10 @@ async function main() {
   const server = createHTTPServer({
     createContext: createContext,
     router: appRouter,
+    middleware:
+      (process.env.NODE_ENV ?? "development") == "production"
+        ? undefined
+        : cors(),
   });
 
   server.listen(3000);