Azure Responses API base_url changed to not include /deployments/:model

[weilandia]

Describe the bug
The Azure Responses API base_url changed to not include /deployments/:model and instead is just https://YOUR-RESOURCE-NAME.openai.azure.com/openai/responses?api-version=.

You may not want to support this and instead just rely on folks passing in the correct base uri, but currently this broke our compatibility of using the same client for both the responses and chat api. We could dynamically remove that bart of the base uri if it is an Azure call AND a responses API call.

To Reproduce
Steps to reproduce the behavior:

1. Initialize a typical azure client with a base url that includes /deployment/:model
2. Confirm the chat api works
3. Try the respones api
4. See 404 error

Expected behavior
Ideally we could use the same client for both the chat and responses apis.

[weilandia]

We currently use a wrapper around this gem's client to do this:

    ### The Azure API changed and the responses api no longer supports the /deployments/model endpoints. This is better, but backwards compat with the Chat API is weird and requires this:
    if responses_api && config[:uri_base]
      config[:uri_base] = config[:uri_base].split("/deployments").first
    end
    ###