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.

src/anyimage/server/geometry/prediction_artifacts.py

@@ -64,16 +64,13 @@ def generate_moge_artifacts(
         parameters.get("max_input_size", DEFAULT_MAX_AI_INPUT_SIZE),
     )
     try:
-        frames = moge.infer(
+        frame = moge.infer(
             context.resource("model_manager"),
             parameters,
-            [model_path],
+            model_path,
             include_points=generate_depth,
             cancel_check=context.check_cancelled,
         )
-        if len(frames) != 1:
-            raise ValueError("Artifact generation requires one geometry frame")
-        frame = frames[0]
         result = {}
         if generate_depth:
             context.progress(0.45, "Generating depth texture")