audio transcription with buffer not work

[seanchann]

Describe the bug

In Audio components, the transcribe API if you use the following code:

netimpl::components::Multipart form = { {"file", netimpl::components::Buffer{buffer.begin(), buffer.end(), "test.wav"}}, {"model", model}};

then in curl post a request to OpenAI server that not work. the error is a request body, not a file.

To Reproduce

1. use transcribe API. but with a buffer part.
2. call function send a HTTP request

Code snippets

in void liboai::netimpl::Session::SetMultipart(components::Multipart&& multipart):

`
			else if (part.is_buffer) {
				mimedata.push_back(curl_mime_addpart(this->mime));
				e[1] = curl_mime_name(mimedata.back(), part.name.c_str());
				e[2] = curl_mime_data(mimedata.back(), reinterpret_cast<const char*>(part.data), part.datalen);
			}
`

not apppend `curl_mime_filename(mimedata.back(),
                                     part.value.c_str());`  caused problems

OS

linux

Library version

liboai 4.0.1