- Add GET /api/reports/summary — KPI cards (revenue, appointments, clients)
- Add GET /api/reports/revenue — revenue by day/week/month and by groomer
- Add GET /api/reports/appointments — appointment trends with status breakdown
- Add GET /api/reports/services — service popularity and revenue by service
- Add GET /api/reports/clients — new clients, active count, churn risk list
- Add GET /api/reports/export.csv — CSV export for revenue, appointments, services
- Add Reports page at /reports with date range picker and group-by control
- Wire Reports into nav and routing in App.tsx
Co-Authored-By: Paperclip <noreply@paperclip.ing>