Add aftersales work order frontend pages

- Public scan-to-confirm page (/aftersales/:sn) with phone last-4 verification
- Admin list + detail pages with state machine, QR generation, reassign, force-close
- PublicLayout extracted from PublicQuery so both pages share logo + 备案 chrome
- PublicQuery auto-redirects scanned zjbf-sh-* serials to the aftersales page
- AdminLayout: new 售后工单 menu entry

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

AGENTS.md

@@ -88,6 +88,8 @@ src/
   - `serialApi` - Serial number management
   - `companyApi` - Company management
   - `dashboardApi` - Dashboard statistics
+  - `employeeSerialApi` - Employee serial management
+  - `aftersalesApi` - Aftersales work orders (admin + public)
 - Auth token automatically added via axios interceptor
 - All API calls return typed responses based on `src/types/index.ts`
 
@@ -97,6 +99,9 @@ src/
 - Admin pages wrapped with `<AdminRoutes>` layout component
 - Use `useNavigate()` for programmatic navigation
 - Use `useLocation()` to get current path
+- Public routes (no auth): `/login`, `/query`, `/aftersales/:serialNumber`
+- `PublicQuery` auto-redirects scanned `zjbf-sh-*` serials to `/aftersales/:serialNumber`
+- Shared public-page chrome (logo + 备案 footer) lives in `components/PublicLayout.tsx`
 
 ### State Management
 - Use React hooks (`useState`, `useEffect`) for local component state