When the file encoding is GBK, reading the file will result in garbled characters

### App Version

3.16.6

### API Provider

DeepSeek

### Model Used

deepseek v3

### 🔁 Steps to Reproduce

1. Set VSCode's default encoding to GBK
2. Let roo-code edit this file

### 💥 Outcome Summary (Optional)

_No response_

### 📄 Relevant Logs or Errors

```shell

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