POST /member/update HTTP/1.1
Host: api.glowb.com
Content-Type: multipart/form-data

curl -X POST "https://api.glowb.com/member/update" \
  -F "business_data=@business.json;type=application/json" \
  -F "file=@profile.jpg"

const formData = new FormData();
formData.append('business_data', JSON.stringify({
  member: {
    id: 'business_id',
    password: 'password123',
    email: 'business@example.com'
  },
  business: {
    business_name: '기업명',
    manager_name: '담당자명',
    phone: '010-1234-5678'
  }
}));
formData.append('file', profileImage);

const response = await fetch('/member/update', {
  method: 'POST',
  body: formData
});