Replace all hardcoded/demo data with live API calls:
- KPIs from /pos/api/register/daily-summary (ventas, tickets, promedio, cajas)
- Inventory alerts from /pos/api/inventory/alerts (zero, low, over stock)
- Top products aggregated from /pos/api/sales detail items
- Weekly bar chart from 7-day daily summaries
- Recent sales table with real items from sale detail endpoint
- Auto-refresh every 2 minutes, manual refresh button
- Dynamic greeting with time-of-day and JWT user name
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>