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/test/configs.py

@@ -0,0 +1,9 @@
+import pathlib
+
+
+class DirectoryConfig:
+    """Helper class for test directories."""
+
+    def __init__(self, test_images: pathlib.Path, sample_images: pathlib.Path):
+        self.test_images = test_images
+        self.sample_images = sample_images