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.

src/anyimage/operators/upscale.py

@@ -8,14 +8,14 @@ from ..server.media.resolution import (
     MIN_MAX_AI_INPUT_SIZE,
 )
 from ..runtime import JobOperatorBase
-from .common.ai_job import (
+from ..common.ai_job import (
     require_input_path,
     invoke_ai_setup_if_needed,
     production_device,
     require_environment,
     require_model,
 )
-from .common.image_data import (
+from ..common.image_data import (
     cleanup_image_input,
     default_extract_frames,
     is_image_empty,