Add new functionality for image rectification and depth metadata handling

- Implemented a preview tool for rectifying images with interactive aspect controls in `preview.py`.
- Added tests for depth metadata loading to ensure consistent schema usage in `test_depth_metadata.py`.
- Developed comprehensive tests for cutout calibration processes in `test_cutout_calibration.py`, including stability checks and depth calibration.
- Created tests for frame compositing operations in `test_frame_compositing.py`, ensuring correct handling of depth and transparency.
- Introduced material slot inheritance functionality in `material_slots.py` to manage geometry material assignments.
- Built shared shader nodes for material processing in `shader.py`, including roughness and bump mapping setups.

docs/internals/operators/frame.md

@@ -1,6 +1,6 @@
 # Frame 多图合成
 
-`operators/frame_tool.py` 定义 `FrameImages` 和 `FrameTool`。Frame 将选中的静态 Image Empty 按当前视图合成为一张图片。
+`operators/frame_tool/operators.py` 定义 `FrameImages` 和 `FrameTool`。`projection.py` 负责视图投影、交叠和结果平面定位，`compositing.py` 负责像素深度排序与边界覆盖采样，`__init__.py` 导出类型及注册清单。Frame 将选中的静态 Image Empty 按当前视图合成为一张图片。
 
 ```mermaid
 flowchart TD