feat(web-client-tpos): Phase A — categories CRUD, order management, shop update, reports
BFF Endpoints (6 new):
- POST/PUT/DELETE categories — full CRUD with shop ownership validation
- GET orders/{id} — order detail with items
- PUT orders/{id}/cancel — cancel non-completed orders (status=6)
- PUT shops/{id} — update name, phone, email, hours
- GET reports/revenue — daily/weekly/monthly revenue aggregation
PosDataService (8 new methods):
- CreateCategory, UpdateCategory, DeleteCategory
- GetOrderDetail, CancelOrder
- UpdateShop
- GetRevenueReport
ShopPage UI (222 lines):
- Menu tab: categories table with add/edit/delete
- Finance tab: expandable order rows with items + cancel button
- Overview tab: shop info edit form
- Reports tab: period selector (Ngày/Tuần/Tháng) + revenue table
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