Add tools and tests for AnyImage model management and documentation

- Implement sync_models.py for preparing and uploading ONNX artifacts.
- Create build_node.py for building and validating Blender scripts.
- Add docs.py for building and previewing documentation with Mike or MkDocs.
- Introduce model_exports.py for exporting PyTorch models to ONNX format.
- Develop pack.py for packaging the project with dependencies for different platforms.
- Add test_sync_models.py to validate sync_models functionality.
- Add test_tool_commands.py to ensure repository tools have correct command scripts.
- Initialize tools package with __init__.py.

.gitignore

@@ -1,6 +1,7 @@
 __pycache__/
 *.py[cod]
 .venv/
+.env
 .uv-cache/
 dist/
 build/
@@ -8,4 +9,5 @@ build/
 .pytest_cache/
 
 /models/
-wheels/
+/.model-cache/
+wheels/