Migrate to Vite for proper production builds with code splitting and optimization

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

vite.config.ts

@@ -0,0 +1,27 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    port: 3001,
+    proxy: {
+      '/api': {
+        target: 'http://backend.control-plane.svc.cluster.local:3000',
+        changeOrigin: true,
+      },
+    },
+  },
+  build: {
+    outDir: 'dist',
+    sourcemap: false,
+    minify: 'esbuild',
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          'react-vendor': ['react', 'react-dom', 'react-router-dom'],
+        },
+      },
+    },
+  },
+})