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/convert-to-panorama.md

@@ -0,0 +1,14 @@
+# Panorama 转换
+
+`operators/convert_to_panorama/` 将静态 2:1 等距柱状 Image Empty 转换为径向深度表面。`operators.py` 提交任务，`object.py` 导入对象，`__init__.py` 汇总导出与注册清单。
+
+```mermaid
+flowchart TD
+    A[准备颜色与分析图] --> B[generate-panorama-geometry]
+    B --> C[采样 12 个透视视图并推理]
+    C --> D[融合径向距离与有效性]
+    D --> E[写出 depth.exr 与 depth.json]
+    E --> F[创建材质与 O Image Depth Panorama]
+```
+
+任务使用 Preferences 选择的几何模型。源颜色由 Blender 侧保存，Server 的 `geometry/panorama.py` 负责视图采样与距离融合，`jobs/panorama.py` 编排推理和产物写入。