Add OpenAI GPT-4.1 model family

[PeterDaveHello]

Reference:

• https://openai.com/index/gpt-4-1/
• https://platform.openai.com/docs/models/gpt-4.1

[Copilot]

Pull Request Overview

This PR introduces support for the new GPT-4.1 model family by adding corresponding model keys and definitions to the configuration.

• Added new entries for GPT-4.1, GPT-4.1 mini, and GPT-4.1 nano to the chatgptApiModelKeys array.
• Extended the Models object with keyed definitions for the new GPT-4.1 models.

[PeterDaveHello]

/review

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[PeterDaveHello]

/improve

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