update hash router

frontend/src/App.js

@@ -1,7 +1,7 @@
 import React from "react";
 import { Box, Container, CssBaseline } from "@mui/material";
 import {
-  BrowserRouter as Router,
+  HashRouter as Router,
   Routes,
   Route,
   Navigate,

frontend/src/config/api.js

@@ -1,9 +1,12 @@
 // API Configuration
 const API_CONFIG = {
-  // Use the current origin in production and development
-  // This ensures requests are always routed through the Express server
-  // which will proxy them to the backend
-  BASE_URL: window.location.origin,
+  // Use the current origin in production
+  // In development, use localhost:3001 explicitly
+  BASE_URL:
+    process.env.NODE_ENV === "development" ||
+    window.location.hostname === "localhost"
+      ? "http://localhost:3001"
+      : window.location.origin,
 };
 
 export default API_CONFIG;