[CLAUDE] Phase1: foundation - BE Clean Arch + Identity + JWT + 2 FE React + login E2E

Backend (.NET 10):
- Domain: BaseEntity/AuditableEntity, ContractType/Phase/ApprovalDecision enums, User/Role (Identity<Guid>), AppRoles (12 const)
- Application: IApplicationDbContext/ICurrentUser/IDateTime/IJwtTokenService, custom exceptions, ValidationBehavior (MediatR pipeline), Auth CQRS (Login/Refresh/Me), DependencyInjection
- Infrastructure: ApplicationDbContext (IdentityDbContext), AuditingInterceptor (auto audit + soft delete), DbInitializer (seed 12 role + admin), DesignTimeDbContextFactory, JwtTokenService, DateTimeService, DI
- Api: CurrentUserService, GlobalExceptionMiddleware (ProblemDetails), AuthController, Program.cs rewrite (Serilog + JWT + CORS + Swagger), appsettings + launchSettings (port 5443)
- Migration Init applied to SolutionErp_Dev LocalDB

Frontend (React 19 + Vite 8 + Tailwind 4):
- fe-admin (:8082 blue) + fe-user (:8080 emerald) - shared structure, khac menu + brand color
- Tailwind 4 via @tailwindcss/vite plugin, theme brand colors
- AuthContext (localStorage token), ProtectedRoute, Layout (sidebar + header)
- UI kit: Button/Input/Label (CVA + Tailwind)
- LoginPage voi toast error, DashboardPage/InboxPage placeholder
- Axios interceptor: auto Bearer + 401 redirect
- TanStack Query client, React Router 7, Sonner toast

Package downgrades (do .NET 10 / TS 6 compat):
- MediatR 14 -> 12.4.1 (v14 breaking changes)
- Swashbuckle 10 -> 6.9.0 (v10 khong tuong thich OpenApi 2)
- Removed Microsoft.AspNetCore.OpenApi (conflict voi Swashbuckle)

E2E verified: POST /api/auth/login qua Vite proxy ca 2 FE -> JWT + user info

Credentials seed: admin@solutionerp.local / Admin@123456

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

src/Backend/SolutionErp.Api/Services/CurrentUserService.cs

@@ -0,0 +1,34 @@
+using System.Security.Claims;
+using SolutionErp.Application.Common.Interfaces;
+
+namespace SolutionErp.Api.Services;
+
+public class CurrentUserService : ICurrentUser
+{
+    private readonly IHttpContextAccessor _accessor;
+
+    public CurrentUserService(IHttpContextAccessor accessor)
+    {
+        _accessor = accessor;
+    }
+
+    private ClaimsPrincipal? User => _accessor.HttpContext?.User;
+
+    public Guid? UserId
+    {
+        get
+        {
+            var sub = User?.FindFirstValue(ClaimTypes.NameIdentifier)
+                ?? User?.FindFirstValue("sub");
+            return Guid.TryParse(sub, out var id) ? id : null;
+        }
+    }
+
+    public string? Email => User?.FindFirstValue(ClaimTypes.Email);
+    public string? FullName => User?.FindFirstValue("fullName");
+
+    public IReadOnlyList<string> Roles =>
+        User?.FindAll(ClaimTypes.Role).Select(c => c.Value).ToList() ?? new List<string>();
+
+    public bool IsAuthenticated => User?.Identity?.IsAuthenticated ?? false;
+}