Feature/multi-view screenshot (#840)
* chore: update Unity package to beta version 9.4.8-beta.8
* feat: contact sheet compositor for batch screenshots
- Batch surround/orbit modes now return a single composite contact sheet image
- Added orbit mode with configurable azimuth, elevations, distance, FOV
- Contact sheet tiles are labeled with compass directions (front, back_left, etc.)
- CLI saves contact sheet PNGs to Assets/Screenshots/ by default
- ScreenshotUtility: RenderCameraToTexture, ComposeContactSheet with 5x7 pixel font
- Server manage_scene.py: orbit params forwarding
- CLI raw command: nargs fix for Windows argument splitting
- Updated docs: CLI_USAGE, CLI_EXAMPLE, SKILL.md, tools-reference
* Doc Update
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Shutong Wu
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