{
  "service": "cf-relay",
  "status": "ok",
  "upstreams": [
    "gemini",
    "groq",
    "openrouter"
  ],
  "usage": "/<upstream>/<path> — 例：/gemini/v1beta/models",
  "note": "Worker 不持有任何密钥，密钥由调用方在请求头携带"
}