Gateway: add browser control UI

ui/vite.config.ts

@@ -0,0 +1,19 @@
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { defineConfig } from "vite";
+
+const here = path.dirname(fileURLToPath(import.meta.url));
+
+export default defineConfig({
+  base: "/ui/",
+  build: {
+    outDir: path.resolve(here, "../dist/control-ui"),
+    emptyOutDir: true,
+    sourcemap: true,
+  },
+  server: {
+    host: true,
+    port: 5173,
+    strictPort: true,
+  },
+});