[Bug] 添加自定义模型信息后报错 Uncaught (in promise) Error: Model chatglm3-6b not found in DEFAULT_MODELS array.

### Bug Description

Uncaught (in promise) Error: Model chatglm3-6b not found in DEFAULT_MODELS array.

### Steps to Reproduce

1、设置自定义模型 chatglm3-6b
2、发送消息，显示无信息发送，日志显示报错
Uncaught (in promise) Error: Model chatglm3-6b not found in DEFAULT_MODELS array.

### Expected Behavior

支持自定义模型选择可以推理

### Screenshots

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### Deployment Method

- [ ] Docker
- [ ] Vercel
- [ ] Server

### Desktop OS

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### Desktop Browser

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### Desktop Browser Version

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### Smartphone Device

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### Smartphone OS

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### Smartphone Browser

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### Smartphone Browser Version

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### Additional Logs

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Search the TypeScript codebase for the DEFAULT_MODELS array and trace the model-selection path used when sending a message. Reproduce the issue with the custom model chatglm3-6b, then verify that selecting it no longer raises the reported error and that a message can be sent for inference.

Written by the indexing model from the issue text.