Please add an option that lets us use "max_completion_tokens" instead of "max_tokens"

[icysnowyyy]

Describe the bug
问题描述
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GPT-5/5.1 uses “max_completion_tokens” instead of “max_tokens”, so an error occurs when using the old parameter

To Reproduce
如何复现
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• Simply send any request using the GPT-5/5.1 model

Expected behavior
期望行为
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• It should work the same way as the legacy models

Screenshots
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Please complete the following information):
请补全以下内容

• OS: [e.g. Windows] Windows 11
• Browser: [e.g. chrome, safari] Chrome
• Extension Version: [e.g. v2.0.2] v2.5.9

Additional context
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