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  containers, images, volumes, networks and outdated image detection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>

README.md

@@ -38,6 +38,7 @@ Requires Python ≥ 3.9 and NAPALM ≥ 4.0.
 | `SwitchDriver` | Ethernet switches | Cisco IOS, Arista EOS, Juniper EX |
 | `FirewallDriver` | Firewalls & UTM appliances | pfSense, Fortinet FortiOS, Cisco ASA |
 | `HypervisorDriver` | Hypervisors & virtualisation platforms | Proxmox VE, VMware ESXi, KVM/libvirt |
+| `OSDriver` | General-purpose operating systems | Linux, BSD, macOS |
 | `StorageDriver` | Storage appliances & NAS/SAN | TrueNAS, Synology DSM, QNAP QTS |
 
 ## Usage
@@ -105,6 +106,34 @@ class ProxmoxDriver(HypervisorDriver):
         ...
 ```
 
+### OS / Linux
+
+```python
+from napalm_device_types import OSDriver
+
+class LinuxDriver(OSDriver):
+
+    def get_packages(self):
+        # return List[PackageDict]
+        ...
+
+    def get_services(self):
+        # return List[ServiceDict]
+        ...
+
+    def get_users(self):
+        # return List[UserDict]
+        ...
+
+    def get_processes(self):
+        # return List[ProcessDict]
+        ...
+
+    def get_cron_jobs(self):
+        # return List[CronJobDict]
+        ...
+```
+
 ### Storage / NAS
 
 ```python