refactor(video): single Foley-style upload loader with inline preview

Replace the path+dropdown loader (and its non-rendering ui.gifs) with one
node mirroring FoleyTuneVideoLoaderUpload: a `video` upload widget with
drag-drop and an inline video preview, shipped via web/js/UniverSRVideo.js
(adapted from FoleyTuneVideo.js) + WEB_DIRECTORY.

The loader now outputs (UNIVERSR_VIDEO, AUDIO) so you can super-resolve the
audio and remux it. Updated the example workflow output order and README.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

__init__.py

@@ -17,4 +17,8 @@ try:
 except Exception as e:  # video nodes are optional (need ffmpeg/soundfile)
     print(f"[ComfyUI-UniverSR] Failed to load video nodes: {e}")
 
-__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS"]
+# Serves web/js/UniverSRVideo.js — the inline video preview + upload widget.
+# (./web + web/js/ + ../../../scripts imports mirrors the FoleyTune layout exactly.)
+WEB_DIRECTORY = "./web"
+
+__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS", "WEB_DIRECTORY"]