Add custom nodes, Civitai loras (LFS), and vast.ai setup script

Includes 30 custom nodes committed directly, 7 Civitai-exclusive
loras stored via Git LFS, and a setup script that installs all
dependencies and downloads HuggingFace-hosted models on vast.ai.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

custom_nodes/rgthree-comfy/py/utils_userdata.py

@@ -0,0 +1,50 @@
+import os
+
+from .utils import load_json_file, path_exists, save_json_file
+
+THIS_DIR = os.path.dirname(os.path.abspath(__file__))
+USERDATA = os.path.join(THIS_DIR, '..', 'userdata')
+
+
+def read_userdata_file(rel_path: str):
+  """Reads a file from the userdata directory."""
+  file_path = clean_path(rel_path)
+  if path_exists(file_path):
+    with open(file_path, 'r', encoding='UTF-8') as file:
+      return file.read()
+  return None
+
+
+def save_userdata_file(rel_path: str, content: str):
+  """Saves a file from the userdata directory."""
+  file_path = clean_path(rel_path)
+  with open(file_path, 'w+', encoding='UTF-8') as file:
+    file.write(content)
+
+
+def delete_userdata_file(rel_path: str):
+  """Deletes a file from the userdata directory."""
+  file_path = clean_path(rel_path)
+  if os.path.isfile(file_path):
+    os.remove(file_path)
+
+
+def read_userdata_json(rel_path: str):
+  """Reads a json file from the userdata directory."""
+  file_path = clean_path(rel_path)
+  return load_json_file(file_path)
+
+
+def save_userdata_json(rel_path: str, data: dict):
+  """Saves a json file from the userdata directory."""
+  file_path = clean_path(rel_path)
+  return save_json_file(file_path, data)
+
+
+def clean_path(rel_path: str):
+  """Cleans a relative path by splitting on forward slash and os.path.joining."""
+  cleaned = USERDATA
+  paths = rel_path.split('/')
+  for path in paths:
+    cleaned = os.path.join(cleaned, path)
+  return cleaned