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-custom-scripts/py/system_notification.py

@@ -0,0 +1,41 @@
+# Hack: string type that is always equal in not equal comparisons
+class AnyType(str):
+    def __ne__(self, __value: object) -> bool:
+        return False
+
+
+# Our any instance wants to be a wildcard string
+any = AnyType("*")
+
+
+class SystemNotification:
+    @classmethod
+    def INPUT_TYPES(s):
+        return {"required": {
+            "message": ("STRING", {"default": "Your notification has triggered."}),
+            "any": (any, {}),
+            "mode": (["always", "on empty queue"], {}),
+        }}
+
+    FUNCTION = "nop"
+    INPUT_IS_LIST = True
+    OUTPUT_IS_LIST = (True,)
+    OUTPUT_NODE = True
+    RETURN_TYPES = (any,)
+
+    CATEGORY = "utils"
+
+    def IS_CHANGED(self, **kwargs):
+        return float("NaN")
+
+    def nop(self, any, message, mode):
+        return {"ui": {"message": message, "mode": mode}, "result": (any,)}
+
+
+NODE_CLASS_MAPPINGS = {
+    "SystemNotification|pysssss": SystemNotification,
+}
+
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "SystemNotification|pysssss": "SystemNotification 🐍",
+}