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/index.md

@@ -2,16 +2,6 @@
 
 AnyImage 在 Blender 主线程处理交互、像素编辑和数据创建，通过 BlendJob 把模型推理交给独立 Job Server。
 
-```mermaid
-flowchart TD
-    A[Image Empty 或剪贴板图片] --> B[Operator 与手势工具]
-    B --> C{需要 AI？}
-    C -- 是 --> D[准备文件与普通字典参数]
-    D --> E[JobRuntime → Job Server]
-    E --> F[图片与相机元数据]
-    F --> G[Blender 主线程导入]
-    C -- 否 --> G
-    G --> H[Image 编辑或 Mesh 与材质创建]
 ```
 
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