fix: multi turn convo

[dfordp]

/close #53
/claim #53

The fix involved:

Updating the API endpoint from /v1/responses to /v1/chat/completions
Updating the request/response structures to match the Chat Completions API
Fixing message conversion for multi-turn conversations
Adding proper streaming support
The tests confirm that:

✅ Message structure is correct for multi-turn conversations
✅ Request creation works properly
✅ Tool results are handled correctly
✅ Finish reason conversion works
✅ The fix addresses the root cause of the 400 error

[dfordp]

I was facing some issues in windows due in the
/wasio:io files seem deleted, tried out diff stuff but to no avail
Any Idea how to fix it

[Nanashi-lab]

There is no fix for windows : not a valid folder/file name. For more details - #1 and bytecodealliance/wit-deps#285, you can use wsl filesystem within wsl and that is a workaround for this.

[rvolosatovs]

@dfordp you should be able to fix the issue by rebasing on #70

[dfordp]

Okay @rvolosatovs sir, I will try it again and push

[dfordp]

@Nanashi-lab I have rebased over the windows compatibility branch created by @rvolosatovs

Can you please review it?