fix: resolve import issues and add __init__.py for custom node

- Added __init__.py to register the custom node properly
- Fixed folder structure for correct module imports
- Updated node file to handle imports based on the environment

__init__.py

@@ -0,0 +1,11 @@
+from .your_node_file import ComfyUIDepthEstimationNode
+
+NODE_CLASS_MAPPINGS = {
+    "ComfyUIDepthEstimationNode": ComfyUIDepthEstimationNode
+}
+
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "ComfyUIDepthEstimationNode": "Depth Estimation Node"
+}
+
+__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS"]