Replace demo video with compressed mp4 hosted on GitHub Releases

- Compressed from 17 MB (3456x2234, 240fps .mov) to 563 KB (1728p, 30fps .mp4)
- Uploaded to v1.0.0 release assets for GitHub README rendering
- Removed large .mov from git history

Made-with: Cursor

Author: seyeong-han

apps/macos/VoxtralRealtimeApp/README.md

@@ -2,7 +2,7 @@
 
 A native macOS showcase app for [Voxtral-Mini-4B-Realtime](https://huggingface.co/mistral-labs/Voxtral-Mini-4B-Realtime-2602-ExecuTorch) — Mistral's on-device real-time speech transcription model. All inference runs locally on Apple Silicon via [ExecuTorch](https://github.com/pytorch/executorch) with Metal acceleration. No cloud, no network required.
 
-<video src="docs/demo.mov" width="100%" autoplay loop muted></video>
+https://github.com/seyeong-han/executorch-examples/releases/download/v1.0.0/demo.mp4
 
 ## Features