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/azure/manager.py

@@ -67,7 +67,9 @@ class AzureVMManager(VMManager):
                         free_vms.append((vm_path, pid_str))
             return free_vms
 
-    def get_vm_path(self, region):
+    def get_vm_path(self, region, screen_size=(1920, 1080), **kwargs):
+        # Note: screen_size parameter is ignored for Azure provider
+        # but kept for interface consistency with other providers
         self.check_and_clean()
         free_vms_paths = self.list_free_vms(region)
         if len(free_vms_paths) == 0: