Refactor image handling and update foreground processing

- Changed the logic in `remove_background_faces` to keep only faces with all foreground vertices.
- Updated background job to save foreground images with a new naming convention (`color.0001.png`).
- Replaced `copy_frames` with `copy_color_images` in various jobs to ensure consistent image naming.
- Introduced a new function `copy_color_images` to handle the copying of images with a specific naming format.
- Updated the BEN2 model to save output images with a new prefix for better clarity.
- Modified tests to reflect changes in image naming and processing logic.
- Added a new shadeless node group for improved material handling in geometry nodes.
- Enhanced validation scripts to check for new image naming conventions and ensure proper functionality.

tests/test_image_depth.py

@@ -291,12 +291,12 @@ class ImageDepthTest(unittest.TestCase):
             "微信视频2026-07-23_192756_414",
         )
 
-    def test_removed_background_name_strips_video_extension(self):
+    def test_color_name_strips_video_extension(self):
         source_object = SimpleNamespace(data=SimpleNamespace(name="clip.mp4"))
 
         self.assertEqual(
-            self.image_depth.removed_background_data_name(source_object),
-            "clip.foreground",
+            self.image_depth.color_data_name(source_object),
+            "clip.color",
         )
 
     def test_force_sequence_source_keeps_loaded_sequence(self):
@@ -634,19 +634,19 @@ class ImageDepthTest(unittest.TestCase):
 
         self.assertEqual(depth_image.name, "img.depth")
 
-    def test_removed_background_name_uses_source_image_base_name(self):
+    def test_color_name_uses_source_image_base_name(self):
         source_object = SimpleNamespace(
             data=SimpleNamespace(name="img.png"),
         )
 
         self.assertEqual(
-            self.image_depth.removed_background_data_name(source_object),
-            "img.foreground",
+            self.image_depth.color_data_name(source_object),
+            "img.color",
         )
         source_object.data.name = "img.png.001"
         self.assertEqual(
-            self.image_depth.removed_background_data_name(source_object),
-            "img.001.foreground",
+            self.image_depth.color_data_name(source_object),
+            "img.001.color",
         )
 
     def test_surface_displacement_is_set_to_displacement_only(self):