🐛 Bug description [Please make everyone to understand it]

In the settings page, when switching from Doubao or OpenAI platform to Custom Platform, the modelId field incorrectly retains the preset value from the previous platform instead of displaying the custom configuration information fetched from the backend.

🧑‍💻 Step to reproduce

1. Open the settings page
2. Select Doubao platform (modelId will be automatically set to "doubao-seed-1-6-flash-250828")
3. Switch to Custom Platform
4. Observe that the modelId field still shows "doubao-seed-1-6-flash-250828" instead of the custom configuration fetched from the backend

👾 Expected result

Regardless of which platform you switch from to Custom Platform, it should display the custom configuration information fetched from the backend, including the correct modelId, baseUrl, and other fields.

🚑 Any additional information

No response

🛠️ MineContext Version

V0.1.2

💻 Platform Details

Windows11