Refactor geometry generation to standardize Blender object coordinates

- Unified the canonical local frame for generated geometries (Plane, Depth Plane, Relief Plane, Cutout, Depth Cutout) to align with Blender's object coordinate system, setting X as horizontal, Z as up, and +Y as depth.
- Removed the `Depth Axis` parameter from `O Image Cutout` and `O Image Depth Cutout`, simplifying the geometry generation process.
- Updated the depth direction defaults to use +Y instead of -Z for `O Image Relief Plane` and Depth Symmetry.
- Adjusted the geometry nodes to ensure thickness, projection, and shell displacements operate along the Y-axis.
- Implemented new capabilities for handling object space normals to align with the new canonical frame.
- Enhanced the Depth Symmetry functionality to mirror across the canonical Y-axis and perform a final rotation to maintain the correct orientation.
- Added tests to validate the new coordinate system and ensure compatibility with existing assets.

src/anyimage/common/object.py

@@ -3,6 +3,20 @@
 import bpy
 
 
+def blender_frame_rotation():
+    """Map Image Empty local axes to the canonical Blender object frame."""
+    from mathutils import Matrix
+
+    return Matrix(
+        (
+            (1.0, 0.0, 0.0, 0.0),
+            (0.0, 0.0, -1.0, 0.0),
+            (0.0, 1.0, 0.0, 0.0),
+            (0.0, 0.0, 0.0, 1.0),
+        )
+    )
+
+
 def modifier_input_identifier(node_group, name, *, subtype=None):
     for item in node_group.interface.items_tree:
         if item.item_type != "SOCKET" or item.in_out != "INPUT":