sub2api的性能很好，但是路由规则比较死板，一个key只能对应一种协议，搓了了一个 cf 
worker，进行自动路由，一个Key可以调用多个模型。 
使用方法： 
 [Screenshot| 100%] 
/**
 * Cloudflare Worker: model-based API key router for sub2api.
 *
 * Features:
 * - Authenticate clients with a dedicated Worker API key.
 * - Select upstream sub2api key by request model.
 * - Stream upstream responses through without buffering.
 * - No retries.
 *
 * Required env vars:
 *...