Use GitHub user-attachments CDN for sample video, drop large WAV

Replaces the in-repo 8 MB WAV with an inline video player pointing at
the GitHub user-attachments CDN. Keeps the repo lean and gives a
richer demo (waveform + narration video) that plays inline on both
GitHub and Hugging Face. Gitignores public/sample-generations/*.{mp4,wav}
so future big media stays external.

.gitignore

@@ -54,3 +54,7 @@ vibevoice_local_backup/
 # Ignore local Modal scratch scripts
 check_model.py
 run_phase3.py
+
+# Large sample media hosted externally via GitHub user-attachments CDN
+public/sample-generations/*.mp4
+public/sample-generations/*.wav

public/sample-generations/sample-generation-001.wav

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:a5ed09f7df485f3e41c00e557d7ef24ce9796c68a00fdc606ee5fe645fe32f6f
-size 8160044