fix: update DockerVMManager method signatures for interface compatibility (#287)

- Fix delete_vm() method to accept region and **kwargs parameters
- Fix occupy_vm() method to accept pid, region and **kwargs parameters
- Ensures consistency with base VMManager interface and other providers
- Resolves runtime argument mismatch errors when calling these methods

This maintains backward compatibility while fixing the interface contract.

desktop_env/providers/docker/manager.py

@@ -99,7 +99,8 @@ class DockerVMManager(VMManager):
     def check_and_clean(self):
         pass
 
-    def delete_vm(self, vm_path):
+    def delete_vm(self, vm_path, region=None, **kwargs):
+        # Fixed: Added region and **kwargs parameters for interface compatibility
         pass
 
     def initialize_registry(self):
@@ -108,7 +109,8 @@ class DockerVMManager(VMManager):
     def list_free_vms(self):
         return os.path.join(VMS_DIR, DOWNLOADED_FILE_NAME)
 
-    def occupy_vm(self, vm_path):
+    def occupy_vm(self, vm_path, pid, region=None, **kwargs):
+        # Fixed: Added pid, region and **kwargs parameters for interface compatibility
         pass
 
     def get_vm_path(self, os_type, region, screen_size=(1920, 1080), **kwargs):