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/runtime_support.py

@@ -1,28 +1,14 @@
-from tests.support.paths import PROJECT_ROOT
-import importlib.util
-import sys
+import importlib
 import tempfile
 import time
 import unittest
 from pathlib import Path
 
 
-def load_server_module():
-    server_directory = PROJECT_ROOT / "src" / "anyimage" / "server"
-    specification = importlib.util.spec_from_file_location(
-        "server",
-        server_directory / "__init__.py",
-        submodule_search_locations=[str(server_directory)],
-    )
-    module = importlib.util.module_from_spec(specification)
-    sys.modules["server"] = module
-    specification.loader.exec_module(module)
-    return module
-
 class ServerTestCase(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
-        cls.server_module = load_server_module()
+        cls.server_module = importlib.import_module("server")
         importlib.import_module("server.geometry.prediction_artifacts")
         importlib.import_module("server.jobs.cutout")
         from blendjob import JobServer
@@ -33,8 +19,7 @@ class ServerTestCase(unittest.TestCase):
 
         cls.ModelManager, cls.ModelSessionCache = ModelManager, ModelSessionCache
         cls.onnx_runtime = onnx_runtime
-        cls.server = cls.server_module.server
-        cls.app_module = sys.modules["server.app"]
+        cls.app_module = importlib.import_module("server.app")
 
 
     def setUp(self):
@@ -50,6 +35,7 @@ class ServerTestCase(unittest.TestCase):
     def create_server(self):
         source = self.server_module.server
         server = self.JobServer("AnyImage Job Server", storage_root=self.storage_root)
+        self.addCleanup(server.close)
         server.handlers.update(source.handlers)
         server.resource_factories.update(source.resource_factories)
         server.bind(self.storage_root)