feat: add OSDriver base class with Docker and device action APIs

- Introduce OSDriver abstract base class (os.py) for general-purpose OS
  drivers (Linux, BSD, macOS) — registers package management, service
  management, users, processes, cron job and the two new OS-specific
  extension points
- Add get_docker_info() contract: returns DockerInfoDict covering
  containers, images, volumes, networks and outdated image detection
- Add run_device_action() contract: generic extensibility point for
  driver-specific one-off administrative actions
- Fix duplicate TypedDicts in models.py: remove early shadow definitions
  of UserDict, ProcessDict, CronJobDict, ApplyUpdatesResultDict from the
  Common section; keep the more complete definitions in the OS section
- Add Docker TypedDicts: DockerContainerDict, DockerImageDict,
  DockerVolumeDict, DockerNetworkDict, DockerInfoDict
- Add DeviceActionResultDict
- Export OSDriver from package __init__; bump version to 0.3.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "napalm-device-types"
-version = "0.2.0"
+version = "0.3.0"
 description = "Abstract device-type base classes for NAPALM drivers"
 readme = "README.md"
 requires-python = ">=3.9"