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/comfyui_ultimatesdupscale/__init__.py

@@ -0,0 +1,77 @@
+import sys
+import os
+
+# Check for original USDU script
+current_dir = os.path.dirname(os.path.realpath(__file__))
+repos_dir = os.path.join(current_dir, "repositories")
+usdu_dir = os.path.join(repos_dir, "ultimate_sd_upscale")
+if not len(os.listdir(usdu_dir)):
+    print("[USDU] Original USDU script not found, downloading it from https://github.com/Coyote-A/ultimate-upscale-for-automatic1111")
+    import urllib.request
+    import zipfile
+    import shutil
+
+    url = "https://github.com/Coyote-A/ultimate-upscale-for-automatic1111/archive/master.zip"
+    zip_path = os.path.join(current_dir, "usdu_temp.zip")
+
+    urllib.request.urlretrieve(url, zip_path)
+
+    with zipfile.ZipFile(zip_path, "r") as zip_ref:
+        top_folder = zip_ref.namelist()[0].split('/')[0] + '/'
+        for member in zip_ref.namelist():
+            if member.startswith(top_folder) and not member.endswith('/'):
+                target_path = os.path.join(usdu_dir, member[len(top_folder):])
+                os.makedirs(os.path.dirname(target := os.path.join(usdu_dir, member[len(top_folder):])), exist_ok=True)
+                with zip_ref.open(member) as source, open(target, 'wb') as target_file:
+                    shutil.copyfileobj(fsrc=zip_ref.open(member), fdst=target_file)
+
+    os.remove(zip_path)
+    print("[USDU] Original USDU script downloaded successfully")
+
+# Remove other custom_node paths from sys.path to avoid conflicts
+custom_node_paths = [path for path in sys.path if "custom_node" in path]
+original_sys_path = sys.path.copy()
+for path in custom_node_paths:
+    sys.path.remove(path)
+
+# Add this repository's path to sys.path for third-party imports
+repo_dir = os.path.dirname(os.path.realpath(__file__))
+sys.path.insert(0, repo_dir)
+original_modules = sys.modules.copy()
+
+# Place aside potentially conflicting modules
+modules_used = [
+    "modules",
+    "modules.devices",
+    "modules.images",
+    "modules.processing",
+    "modules.scripts",
+    "modules.shared",
+    "modules.upscaler",
+    "utils",
+]
+original_imported_modules = {}
+for module in modules_used:
+    if module in sys.modules:
+        original_imported_modules[module] = sys.modules.pop(module)
+
+# Proceed with node setup
+from .usdu_nodes import NODE_CLASS_MAPPINGS, NODE_DISPLAY_NAME_MAPPINGS
+
+WEB_DIRECTORY = "./js"
+__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS"]
+
+# Clean up imports
+# Remove any new modules
+modules_to_remove = []
+for module in sys.modules:
+    if module not in original_modules:
+        modules_to_remove.append(module)
+for module in modules_to_remove:
+    del sys.modules[module]
+
+# Restore original modules
+sys.modules.update(original_imported_modules)
+
+# Restore original sys.path
+sys.path = original_sys_path