fixed InputTextContentPart.type and Voice

[lloydzhou]

Purpose

1. fixed InputTextContentPart.type
   see: https://platform.openai.com/docs/api-reference/realtime-client-events/conversation/item/create

The content of the message, applicable for message items.
Message items with a role of system support only input_text content, message items of role user support input_text and input_audio content, and message items of role assistant support text content.

2. add more voice
   see https://platform.openai.com/docs/api-reference/realtime-client-events/session/update

The voice the model uses to respond. Supported voices are alloy, ash, ballad, coral, echo, sage, shimmer, and verse.

Does this introduce a breaking change?

• Yes
• No

Pull Request Type

What kind of change does this Pull Request introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation content changes
• Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information