[Miscfg / Bug] "you are not allowed to use xxx model"

### 📦 Deployment Method

Vercel

### 📌 Version

2.15.8

### 💻 Operating System

Windows

### 📌 System Version

11

### 🌐 Browser

Firefox

### 📌 Browser Version

135.0

### 🐛 Bug Description

使用任何非用户自定义模型时，均报错：

```json
{
"error": true,
"message": "you are not allowed to use xxx model"
}
```

env:
```
BYTEDANCE_URL: "https://ark.cn-beijing.volces.com/api/v3"
BYTEDANCE_API_KEY: "xxxx"
DEFAULT_MODEL: "ep-2025xxx7p@bytedance"
CUSTOM_MODELS: "-all,+claude-3-opus-latest,+ep-2025xxx7p@bytedance=DeepSeek-R1"
ENABLE_BALANCE_QUERY: "1"
DISABLE_GPT4: "1"
ANTHROPIC_API_VERSION: "2023-06-01"
ANTHROPIC_API_KEY: "xxxx"
ANTHROPIC_URL: "https://api.anthropic.com/"
OPENAI_API_KEY: "xxxx"
```

### 📷 Recurrence Steps

_No response_

### 🚦 Expected Behavior

期望任何游客均可直接开始对话

### 📝 Additional Information

_No response_