Fix video rendering in README using direct CDN URLs

[Copilot]

GitHub's github.com/.../raw/ redirect URLs fail to render in many browsers when used as video sources.

Changes

• Video element: Switched from redirect URL to direct raw.githubusercontent.com CDN delivery
• Source tag: Moved URL to <source> child element with explicit type="video/mp4" MIME type
• Fallback: Added direct download link for unsupported browsers

Before:

<video src="https://github.com/anxiangsir/asset/raw/main/OneVision/residual_mv.mp4" controls ...>
  Your browser does not support the video tag.
</video>

After:

<video controls ...>
  <source src="https://raw.githubusercontent.com/anxiangsir/asset/main/OneVision/residual_mv.mp4" type="video/mp4">
  Your browser does not support the video tag. <a href="...">Click here to view the video</a>.
</video>

This aligns with existing asset embedding patterns in the README (images at lines 23-25, 93, 98 already use raw.githubusercontent.com).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• github-production-user-asset-6210df.s3.amazonaws.com
  • Triggering command: /usr/bin/curl curl -L REDACTED -o /tmp/image1.png (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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