fix: Add missing import json to depth_estimation_node.py

Resolves NameError: name 'json' is not defined (#18).
The json module is used in _serialize_camera_data() and error handling
but was never imported when DA3 camera pose estimation was added in v1.3.4.

Bump version to 1.3.7.

__init__.py

@@ -12,7 +12,7 @@ logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger("DepthEstimation")
 
 # Version info
-__version__ = "1.3.6"
+__version__ = "1.3.7"
 
 # Node class mappings - will be populated based on dependency checks
 NODE_CLASS_MAPPINGS = {}

depth_estimation_node.py

@@ -1,4 +1,5 @@
 import os
+import json
 import numpy as np
 import torch
 import traceback

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "comfyuidepthestimation"
 description = "A robust custom depth estimation node for ComfyUI using Depth-Anything models (V1, V2, and V3/DA3). It integrates depth estimation with configurable post-processing options including blur, median filtering, contrast enhancement, and gamma correction."
-version = "1.3.6"
+version = "1.3.7"
 license = { file = "LICENSE" }
 dependencies = [
     "transformers>=4.20.0",