Add interactive Omi wearable device lab

[thenpceo]

What this adds

• An interactive 3D Omi wearable study at /device-lab
• A unified device shell with physically informed cord behavior
• Live material, lighting, and environment controls for rapid visual exploration
• A concise product rationale in PRODUCT.md

Preview

https://omi-landing-pi.vercel.app/device-lab

Validation

• npm run build
• Next.js type checking and static generation pass

[vercel]

@thenpceo is attempting to deploy a commit to the matt-mediarai's projects Team on Vercel.

A member of the Team first needs to authorize it.

[thenpceo]

Superseded by #3, which contains the finished concept, mobile pass, optimized scene, walkthrough, and full application context.