调用openrouter模型出现乱码

**反馈标题**：nvidia/nemotron-3-ultra-550b-a55b:free调用出现乱码

**反馈内容：**
```
查��确切字符��
08-14 19:24:24
思考
The actual text is "新建��货单" (with �� not 采). Let me use the correct string.
```

**更换模型出现系统故障**：`[EXECUTION_FAILED] task execution failed: Internal error: OpenCode service failure: {"service":"session"}`

期望效果：修复bug

我的 UID：019fe584-397a-7210-9eca-c01fa6cd3dc9