Add AGENTS.md with Cursor Cloud dev environment setup instructions

[LVT-ENG]

Summary

Adds AGENTS.md with development environment instructions for Cursor Cloud agents.

What's included

• Service startup commands (Vite frontend on 5173, FastAPI backend on 8000)
• Build and TypeScript check notes (known pre-existing import.meta.env errors)
• Environment variable setup reference
• Python dependency file locations

Verification

The full dev environment was set up and verified:

• npm install — 176 packages, 0 vulnerabilities
• pip install -r requirements.txt -r backend/requirements.txt — all Python deps installed
• npm run build — Vite production build succeeds
• FastAPI backend health check returns {"ok":true,"version":"10.5-Soberania"}
• Vite dev server serves the app at http://localhost:5173
• API proxy /api/snap works end-to-end through Vite → FastAPI

Demo

tryonyou_app_demo_interaction.mp4

App loaded and interactive — email input, try-on button, PAU snap all functional.

TryOnYou homepage loaded at localhost:5173

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Project	Deployment	Actions	Updated (UTC)
tryonyou-app	Ready	Preview, Comment	Apr 9, 2026 5:18am
tryonyou-pilot	Error		Apr 9, 2026 5:18am