feat: Phase 2 frontend — Spa, Retail, Cafe Blazor UI pages and BFF proxies
Spa/Beauty UI (booking-service integration):
- TherapistManagement.razor: CRUD table, specialty multi-select, working hours
- AppointmentCalendar.razor: daily calendar grouped by therapist, color-coded statuses
- ShopTherapists embedded component for ShopPage, sidebar menu for spa/beauty
- BookingController BFF: therapist CRUD + appointment proxy endpoints
- Localization: vi-VN + en-US for "Nhân viên trị liệu"
Retail POS UI (catalog + inventory + order integration):
- RetailDesktop.razor: barcode input, API lookup, stock badges, cart warnings
- ReturnDialog.razor: order lookup, return/exchange mode toggle, refund summary
- StockOverview.razor: admin stock table, search/filter, threshold edit dialog
- PosDataService: barcode lookup, bulk stock, return/exchange API methods
Cafe UI (membership + fnb-engine integration):
- StampCard.razor: visual stamp grid, animated fill, celebration UI, claim/reset
- BaristaQueue.razor: 3-column Kanban, stats bar, auto-refresh 10s, pulse animation
- CafeController BFF: stamp cards + barista queue proxy endpoints
Infrastructure:
- Traefik: added /api/v1/therapists + /api/v1/appointments to booking-service
- ROADMAP: Phase 2 vertical tasks DONE, UI refinement IN-PROGRESS
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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