feat(web-client-tpos): add staff update/delete and inventory update CRUD
BFF Endpoints:
- PUT /api/bff/staff/{id} — update employee code, role, phone, email
- DELETE /api/bff/staff/{id} — soft-delete (set status=Terminated)
- PUT /api/bff/inventory/{id} — update quantity and reorder level
- Fix CreateStaff: Forbid→Unauthorized, add created_at to INSERT
PosDataService Methods:
- UpdateStaffAsync(Guid, CreateStaffRequest)
- DeleteStaffAsync(Guid)
- UpdateInventoryAsync(Guid, UpdateInventoryRequest)
ShopPage.razor UI:
- Staff table: new Hành động column with edit/delete buttons
- Staff form: switches between Thêm/Chỉnh sửa mode
- EditStaff, SaveStaffEdit, DeleteStaffMember methods
15b17f54ca