[EPIC] Unity Package Sample

[rob1997]

Objective

Deliver a complete Unity package sample experience that demonstrates core Open Creator Rails flows (token gating, subscription/access checks, and UI-driven interactions) with production-quality presentation and clear developer guidance.

Estimation

Dependencies

Part of #1

Related child issues:

• UPM package sample demo UI for OCR functions #9 (UPM package sample demo UI for OCR functions)
• Display multiple subscription pricing tiers in sample demo #10 (Display multiple subscription pricing tiers in sample demo)
• Enhance sample demo with animations, environment, VFX, and audio #11 (Enhance sample demo with animations, environment, VFX, and audio)