docs(architecture): create comprehensive UX engineer interface documentation - Add UX-Engineer-Onboarding.md as primary starting point for new team members - Add API-Quick-Reference.md for daily command lookup and common workflows - Add API-Interfaces-Backend.md for detailed interface specifications - Establish clear documentation flow: Onboarding → Quick Reference → Detailed Docs - Include cross-references between all documents for seamless navigation - Provide complete command tables, error handling patterns, and TypeScript examples - Document generated types location and usage patterns - Focus on interface-first development without exposing backend implementation details

inauman committed Jul 21, 2025