fix: cors backend

Author: Speedrunyourknowledge

calc-backend/src/index.ts

@@ -10,7 +10,7 @@ const PORT = process.env.PORT || 3000;
 const app = express();
 
 app.use(cors({
-    origin: "http://localhost:5173",
+    origin: process.env.FRONTEND_URL || "http://localhost:5173",
     methods: ["GET", "POST", "PUT", "DELETE"],
     allowedHeaders: ["Content-Type", "Authorization"],
     credentials: true,