[CLAUDE] Phase1.2: CRUD Master + Permission Matrix + FE admin pages

Backend:
- Domain/Master: Supplier (+ SupplierType 5 loai), Project, Department (AuditableEntity)
- Domain/Identity: MenuItem, Permission, MenuKeys const (12 menu)
- EF Configurations voi unique Code + query filter IsDeleted
- DbSets + IApplicationDbContext interface update
- Application: PagedResult + PagedRequest generic
- Application/Master CQRS CRUD 3 entity (Create/Update/Delete/Get/List voi paging search sort)
- Application/Permissions: GetMyMenuTree (union OR role, filter tree), ListMenuItems, ListPermissionsByRole, UpsertPermission (guard admin khong tu giam quyen), ListRoles
- Api/Authorization: MenuPermissionRequirement + Handler (Admin bypass, query DB)
- Program.cs: register 48 policy {menu}.{action} tu MenuKeys x Actions
- Api/Controllers: Suppliers, Projects, Departments, Menus, Roles, Permissions
- DbInitializer: seed 12 menu + admin full CRUD permissions
- Migration AddMasterData + AddPermissions

Frontend (fe-admin):
- Types: menuKeys.ts const, menu.ts (MenuNode/Role/Permission), master.ts (Supplier/Project/Department + SupplierType const-object)
- AuthContext: load menu from /menus/me, cache localStorage, refreshMenu()
- usePermission hook + PermissionGuard component (wrap button)
- UI kit them: Dialog (modal overlay), Textarea, Select
- Generic: DataTable (column config, sortable, loading, empty) + Pagination
- PageHeader component
- apiError helper extract message tu ProblemDetails
- Layout rewrite: render menu dong tu AuthContext.menu (MenuGroup collapsible + NavLink + lucide icon map)
- Pages: master/Suppliers, master/Projects, master/Departments (CRUD + search + sort + paging + Dialog form)
- Page system/Permissions: ma tran Role x MenuKey x CRUD checkbox (tick tu dong PUT upsert)
- App.tsx them 4 route moi

Bug fix:
- MenuPermissionHandler: EF expression tree khong support switch expression -> tach switch ra ngoai AnyAsync
- TS erasableSyntaxOnly khong cho enum -> SupplierType const-object pattern (typeof[keyof])

E2E verified via Vite proxy:
- GET /menus/me -> 6 root + 6 child nodes (12 menus)
- GET /roles -> 12 roles
- POST/GET/PUT/DELETE /suppliers -> full CRUD, soft delete OK
- tsc -b fe-admin pass

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

src/Backend/SolutionErp.Application/Common/Interfaces/IApplicationDbContext.cs

@@ -1,6 +1,16 @@
+using Microsoft.EntityFrameworkCore;
+using SolutionErp.Domain.Identity;
+using SolutionErp.Domain.Master;
+
 namespace SolutionErp.Application.Common.Interfaces;
 
 public interface IApplicationDbContext
 {
+    DbSet<Supplier> Suppliers { get; }
+    DbSet<Project> Projects { get; }
+    DbSet<Department> Departments { get; }
+    DbSet<MenuItem> MenuItems { get; }
+    DbSet<Permission> Permissions { get; }
+
     Task<int> SaveChangesAsync(CancellationToken cancellationToken = default);
 }

src/Backend/SolutionErp.Application/Common/Models/PagedResult.cs

@@ -0,0 +1,24 @@
+namespace SolutionErp.Application.Common.Models;
+
+public record PagedResult<T>(
+    IReadOnlyList<T> Items,
+    int Total,
+    int Page,
+    int PageSize)
+{
+    public int TotalPages => (int)Math.Ceiling(Total / (double)PageSize);
+    public bool HasNext => Page * PageSize < Total;
+    public bool HasPrev => Page > 1;
+}
+
+public abstract record PagedRequest
+{
+    private int _page = 1;
+    private int _pageSize = 20;
+
+    public int Page { get => _page; init => _page = value < 1 ? 1 : value; }
+    public int PageSize { get => _pageSize; init => _pageSize = value switch { < 1 => 20, > 200 => 200, _ => value }; }
+    public string? Search { get; init; }
+    public string? SortBy { get; init; }
+    public bool SortDesc { get; init; }
+}