feat: add gemini-3.1-flash-lite-preview and gpt-5.4

docs/agent.md

@@ -143,7 +143,7 @@ Agent模式推荐使用以下模型，可根据效果及成本综合选择：
 - **Doubao**: `doubao-seed-2-0-code-preview-260215`
 - **Qwen**: `qwen3.5-plus`
 - **Claude**: `claude-sonnet-4-6`
-- **Gemini**: `gemini-3.1-pro-preview`
+- **Gemini**: `gemini-3.1-flash-lite-preview`
 - **OpenAI**: `gpt-5.4`
 
 详细模型配置方式参考 [README.md 模型说明](../README.md#模型说明)

docs/en/models/gemini.mdx

@@ -12,5 +12,5 @@ description: Google Gemini model configuration
 
 | Parameter | Description |
 | --- | --- |
-| `model` | Options include `gemini-3.1-pro-preview`, `gemini-3-flash-preview`, `gemini-3-pro-preview`, `gemini-2.5-pro`, `gemini-2.0-flash`, etc. See [official docs](https://ai.google.dev/gemini-api/docs/models) |
+| `model` | Options include `gemini-3.1-flash-lite-preview`, `gemini-3.1-pro-preview`, `gemini-3-flash-preview`, `gemini-3-pro-preview`, etc. See [official docs](https://ai.google.dev/gemini-api/docs/models) |
 | `gemini_api_key` | Create at [Google AI Studio](https://aistudio.google.com/app/apikey) |

docs/models/gemini.mdx

@@ -12,5 +12,5 @@ description: Google Gemini 模型配置
 
 | 参数 | 说明 |
 | --- | --- |
-| `model` | 支持 `gemini-3.1-pro-preview`、`gemini-3-flash-preview`、`gemini-3-pro-preview`、`gemini-2.5-pro`、`gemini-2.0-flash` 等，参考 [官方文档](https://ai.google.dev/gemini-api/docs/models) |
+| `model` | 支持 `gemini-3.1-flash-lite-preview`、`gemini-3.1-pro-preview`、`gemini-3-flash-preview`、`gemini-3-pro-preview` 等，参考 [官方文档](https://ai.google.dev/gemini-api/docs/models) |
 | `gemini_api_key` | 在 [Google AI Studio](https://aistudio.google.com/app/apikey) 创建 |