fix: standardize provider interface parameters across all implementations

- Add screen_size parameter to get_vm_path() for all providers (with default 1920x1080)
- Add os_type parameter to start_emulator() for Azure and VirtualBox providers
- Add region parameter to stop_emulator() for VMware, Docker, and VirtualBox providers
- Use *args, **kwargs for better extensibility and parameter consistency
- Add documentation comments explaining ignored parameters for interface consistency
- Prevents TypeError exceptions when AWS-specific parameters are passed to other providers

This ensures all providers can handle the same parameter sets while maintaining
backward compatibility and avoiding interface fragmentation.

desktop_env/providers/docker/provider.py

@@ -144,7 +144,9 @@ class DockerProvider(Provider):
     def revert_to_snapshot(self, path_to_vm: str, snapshot_name: str):
         self.stop_emulator(path_to_vm)
 
-    def stop_emulator(self, path_to_vm: str):
+    def stop_emulator(self, path_to_vm: str, region=None, *args, **kwargs):
+        # Note: region parameter is ignored for Docker provider
+        # but kept for interface consistency with other providers
         if self.container:
             logger.info("Stopping VM...")
             try: