fix: remove fallback to old backend URL, use only env variable for API base URL

Author: HackStyx

src/components/layout/Sidebar.jsx

@@ -16,7 +16,7 @@ import {
   HiLogout
 } from 'react-icons/hi';
 
-const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || 'https://portfolio-tracker-backend-y7ne.onrender.com/api';
+const API_BASE_URL = import.meta.env.VITE_API_BASE_URL;
 
 // Create axios instance with base URL
 const api = axios.create({

src/components/modals/AddStockModal.jsx

@@ -5,7 +5,7 @@ import { TextInput, NumberInput, Button } from '@tremor/react';
 import axios from 'axios';
 
 // Get API URL from environment variable, fallback to production URL if not set
-const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || 'https://portfolio-tracker-backend-y7ne.onrender.com/api';
+const API_BASE_URL = import.meta.env.VITE_API_BASE_URL;
 
 // Create axios instance with base URL
 const api = axios.create({

src/services/api.js

@@ -1,7 +1,7 @@
 import axios from 'axios';
 import { supabase } from '../config/supabase';
 
-const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || 'https://portfolio-tracker-backend-y7ne.onrender.com/api';
+const API_BASE_URL = import.meta.env.VITE_API_BASE_URL;
 
 // Create axios instance with base URL
 const api = axios.create({