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.

tests/anyimage/server/test_prediction_artifacts.py

@@ -73,7 +73,7 @@ def test_artifacts_preserve_original_geometry_with_alpha(
         check_cancelled=lambda: None,
     )
     with (
-        patch.object(artifacts.moge, "infer", return_value=[frame]),
+        patch.object(artifacts.moge, "infer", return_value=frame),
         patch.object(
             artifacts, "write_depth_texture",
             return_value=tmp_path / "depth.exr",