feat(node_assets): add image plane geometry nodes and validation scripts

- Implemented `image_plane.py` to build the Image Plane Geometry Nodes group with customizable parameters for geometry, subdivide, and thickness.
- Created `image_plane_validation.py` to validate the functionality of the image plane, ensuring correct geometry generation and material assignment.
- Developed `material_layers.py` to construct shader node groups for image materials, including depth and normal handling.
- Authored `plane_layouts.py` to define node arrangements for image geometry assets.
- Introduced `shadeless.py` to create a shadeless shader node group that displays color without scene lighting while preserving shadows and reflections.

docs/internals/operators/index.md

@@ -1,17 +1,15 @@
 # Operator 实现索引
 
-`src/anyimage/operators/` 负责 Blender 侧交互、Job 请求组装和结果导入。
+| 源码（相对 `src/anyimage/`） | 功能 |
+| --- | --- |
+| `operators/ai_setup.py` | [AI 环境管理](ai-setup.md) |
+| `operators/clipboard_image/` | [剪贴板图片](clipboard-image.md) |
+| `operators/convert_to_plane/` | [Plane 与 Depth Plane](convert-to-plane.md) |
+| `operators/cutout_tool/` | [Cutout](cutout-tool.md) |
+| `operators/image_edit_tool/frame.py` | [Frame 多图合成](frame.md) |
+| `operators/image_edit_tool/mask.py` | [Mask Alpha 编辑](mask.md) |
+| `operators/image_edit_tool/rectify.py` | [Rectify 透视校正](rectify.md) |
+| `operators/remove_background.py` | [Remove Background](remove-background.md) |
+| `operators/upscale.py` | [Upscale](upscale.md) |
 
-| Operator 路径 | 实现页 | 主要职责 |
-| --- | --- | --- |
-| `operators/__init__.py` | 本页 | 汇总 Blender 类型注册顺序 |
-| `operators/ai_setup.py` | [AI 环境管理](ai-setup.md) | 环境安装、模型下载与缓存释放 |
-| `operators/clipboard_image/` | [Clipboard Image](clipboard-image.md) | 系统剪贴板读取、粘贴与快捷键 |
-| `operators/convert_to_plane/` | [Convert to Plane](convert-to-plane.md) | Mesh Plane 与 Depth Plane 创建 |
-| `operators/cutout_tool/` | [Cutout Tool](cutout-tool.md) | Selection、基础 Shape 构建与 Blender 对象创建 |
-| `operators/image_edit_tool/` | [Image Edit Tool](image-edit-tool.md) | Frame 合成、Mask Alpha 编辑与 Rectify 透视校正 |
-| `operators/debug.py` | [Debug Operator](debug.md) | 模型接口与原始产物验证 |
-| `operators/remove_background.py` | [Remove Background](remove-background.md) | BEN2 去背与结果替换 |
-| `operators/upscale.py` | [Upscale](upscale.md) | 当前 Image 的 4× 高清与输入长边检查 |
-
-`operators/__init__.py` 聚合注册类，扩展入口按顺序注册并逆序注销。
+类型在 `operators/__init__.py` 和扩展 `__init__.py` 汇总注册。AI Operator 使用普通字典提交任务，并在主线程响应中读取文件和修改 Blender 数据。