P1 Bug Fixes:
- Fix Finance stat spacing (0₫ → 0 ₫)
- Replace 3 empty catch blocks with error state UI + logging
- Make POS button functional (navigate to /pos)
- Add @implements IDisposable to AdminLayout
P2 Code Quality:
- Create ShopVerticalHelper.cs (DRY icon/label/normalize)
- Remove dead overview case from ShopPage.razor
- Delete 15 orphaned admin pages (moved to shop-scope)
- ShopSidebarConfig delegates to ShopVerticalHelper
P3 UX Enhancement:
- Add CTA buttons to all empty states
- Real KPIs in ShopOverview (orders, products, revenue)
- User role from auth token (Admin/Khách)
- Responsive CSS for stat cards, tables, mobile sidebar
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