Fix chat completion parse issue

[bhishmendramahala-crypto]

Summary

Fixes the implementation of chat.completions.parse() so it uses the chat completions API instead of the response API when parsing completions.

Problem

When users called client.chat.completions.parse() (e.g. for response format / structured outputs), the SDK was delegating to the response API. That mismatch could lead to incorrect or inconsistent parsing for chat completion responses.

Solution

parse() now delegates to OAIclient.chat.completions.parse(body, opts) instead of the response API. Calls to chat.completions.parse with a response format are now handled by the correct chat completions API.

Changes

• src/apis/chatCompletions.ts: Updated the parse method to use chat.completions.parse on the OpenAI client instead of the response API.