curl --request POST "https://gptproto.com/v1beta/models/gemini-3-flash-preview:generateContent" \
  --header "Authorization: Bearer $GPTPROTO_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "text": "這張 PNG 圖片中顯示了什麼？"
          },
          {
            "file_data": {
              "mime_type": "image/png",
              "file_uri": "https://tos.gptproto.com/resource/cat.png"
            }
          }
        ]
      }
    ],
    "generationConfig": {
      "thinkingConfig": {
        "includeThoughts": true,
        "thinkingLevel": "HIGH"
      }
    }
  }'