Release Notes:

- Added Mask API key input in Add LLM provider modal


<img width="427" height="430" alt="截屏2026-02-28 17 35 22"
src="https://github.com/user-attachments/assets/ae628815-f7df-4ea0-90ea-a23bbd703521"
/>

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Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>
Co-authored-by: Danilo Leal <daniloleal09@gmail.com>