feat: initial Vite/React frontend service template

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

vite.config.ts

@@ -0,0 +1,19 @@
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    // Local dev: proxy /api to a backend (e.g. the service-template-express dev server).
+    proxy: {
+      "/api": {
+        target: process.env.API_PROXY_TARGET ?? "http://localhost:3000",
+        rewrite: (p) => p.replace(/^\/api/, ""),
+      },
+    },
+  },
+  test: {
+    environment: "jsdom",
+    setupFiles: ["./src/test-setup.ts"],
+  },
+});