Update Feature Type to Support Both Image and Video Backgrounds

[siamak]

Summary

This PR refactors the Feature type to replace bgVideo with a more flexible background field, supporting both image and video assets for light and dark modes.

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Key Changes

1. Renamed bgVideo to background.
2. Added type field ("image" or "video") to specify background type.
3. Introduced image field with support for url and optional metadata (e.g., dimensions, LQIP).
4. Retained video support via MuxVideo under asset.
5. Light and dark mode backgrounds are now optional.

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Impact

• Breaking Change: Existing bgVideo usage must be updated to the new background format.
• Enhanced Flexibility: Supports dynamic content with both images and videos.

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Testing

• Verified correct handling of both image and video types.
• Ensured optional light and dark modes work as intended.

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