fix: update environment variable usage in scripts and enhance CSS theming

apps/web/vite.config.ts

@@ -4,6 +4,11 @@ import { defineConfig } from 'vite';
 
 export default defineConfig({
   plugins: [react()],
+  server: {
+    proxy: {
+      '/api': 'http://localhost:3000',
+    },
+  },
   resolve: {
     alias: {
       '@': path.resolve(__dirname, './src'),