Add tests for clipboard image functionality and mesh plane asset creation

- Implemented a comprehensive test suite for the clipboard image module, covering various functionalities including operator registration, context handling, and image processing.
- Created a new mesh plane asset with customizable parameters and integrated it into the geometry node system.
- Developed a validation script to ensure the correct behavior of the mesh plane asset, including input handling and output verification.

docs/models-and-storage.md

@@ -2,9 +2,9 @@
 
 AnyImage 把运行环境、模型和任务结果放在 Blender 之外，多个 Blender 版本可以共享同一套数据。
 
-## Models 面板
+## Models 设置
 
-打开 3D View 侧栏中的 **AnyImage > Models**，可以查看和下载模型。
+打开 **Edit > Preferences > Extensions > AnyImage**，可以查看和下载模型。右键菜单中的 **AI Environment Settings…** 会直接打开这里。
 
 - **Ready** 表示模型文件已经就绪。
 - **Download** 用于按需下载模型。