vercel.json

{
  "services": {
    "frontend": {
      "root": "frontend",
      "framework": "vite",
      "buildCommand": "npm run build",
      "outputDirectory": "dist"
    },
    "backend": {
      "root": "backend",
      "framework": "fastapi",
      "installCommand": "pip install -r requirements.txt"
    }
  },
  "rewrites": [
    { "source": "/api/(.*)", "destination": { "service": "backend" } },
    { "source": "/(.*)",     "destination": { "service": "frontend" } }
  ],
  "headers": [
    {
      "source": "/(.*)",
      "headers": [
        { "key": "X-Content-Type-Options", "value": "nosniff" },
        { "key": "X-Frame-Options",        "value": "DENY"    },
        { "key": "Referrer-Policy",        "value": "strict-origin-when-cross-origin" }
      ]
    }
  ]
}