Add full-stack project files and structure

backend/pyproject.toml

@@ -0,0 +1,8 @@
+[project]
+name = "backend"
+version = "0.1.0"
+description = "FastAPI backend service"
+requires-python = ">=3.12"
+dependencies = [
+    "fastapi[standard]>=0.128.1",
+]

frontend/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "frontend",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build"
+  },
+  "dependencies": {
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-react": "^5.1.1",
+    "typescript": "~5.9.3",
+    "vite": "^7.2.4"
+  }
+}

frontend/vite.config.ts

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+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+})

vercel.json

@@ -0,0 +1,12 @@
+{
+  "experimentalServices": {
+    "frontend": {
+      "entrypoint": "frontend",
+      "routePrefix": "/"
+    },
+    "backend": {
+      "entrypoint": "backend/main.py",
+      "routePrefix": "/api"
+    }
+  }
+}