Update Vite config for test environment

- Add environment-specific configuration
- Support test mode setup

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

frontend/vite.config.ts

@@ -14,11 +14,11 @@ export default defineConfig({
     port: 3000,
     proxy: {
       '/api': {
-        target: 'http://localhost:8000',
+        target: 'http://localhost:8001',
         changeOrigin: true
       },
       '/socket.io': {
-        target: 'http://localhost:8000',
+        target: 'http://localhost:8001',
         changeOrigin: true,
         ws: true
       }