Initial commit: Image Aspect Size and Multi Switch nodes

- ImageAspectSize: reads input image dimensions and outputs width/height
  scaled to a target longest-side, snapped to multiples of 8, with a
  flip toggle for portrait/landscape rotation
- MultiSwitch: any-type switch node with dynamic slot pairs (JS-driven
  add/remove), colour-coded active/inactive sides, and clean labelling

__init__.py

@@ -0,0 +1,16 @@
+from .nodes.image_aspect_size import ImageAspectSize
+from .nodes.multi_switch import MultiSwitch
+
+NODE_CLASS_MAPPINGS = {
+    "ImageAspectSize": ImageAspectSize,
+    "MultiSwitch":     MultiSwitch,
+}
+
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "ImageAspectSize": "Image Aspect Size",
+    "MultiSwitch":     "Multi Switch",
+}
+
+WEB_DIRECTORY = "./js"
+
+__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS", "WEB_DIRECTORY"]