一个 API，所有 AI 模型

const response = await fetch(
  'https://api.hiapi.ai/v1/chat/completions',
  {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer sk-...',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      model: 'gemini-2.5-flash-image',
      messages: [{ role: 'user', content: 'a cat wearing sunglasses' }]
    })
  }
);