docs: 添加库存3D查看器设计文档

wanshenmean

2026-03-30 b698e3b2147a46fd4adb168aea5df892236cc0e0

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{
  "agents": [],
  "total_spawned": 0,
  "total_completed": 0,
  "total_failed": 0,
  "last_updated": "2026-03-24T02:41:20.073Z"
}