[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.Application/Common/Interfaces/IApplicationDbContext.cs

@@ -0,0 +1,6 @@
+namespace SolutionErp.Application.Common.Interfaces;
+
+public interface IApplicationDbContext
+{
+    Task<int> SaveChangesAsync(CancellationToken cancellationToken = default);
+}

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

@@ -0,0 +1,10 @@
+namespace SolutionErp.Application.Common.Interfaces;
+
+public interface ICurrentUser
+{
+    Guid? UserId { get; }
+    string? Email { get; }
+    string? FullName { get; }
+    IReadOnlyList<string> Roles { get; }
+    bool IsAuthenticated { get; }
+}

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

@@ -0,0 +1,7 @@
+namespace SolutionErp.Application.Common.Interfaces;
+
+public interface IDateTime
+{
+    DateTime UtcNow { get; }
+    DateTime Now { get; }
+}

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

@@ -0,0 +1,9 @@
+using SolutionErp.Domain.Identity;
+
+namespace SolutionErp.Application.Common.Interfaces;
+
+public interface IJwtTokenService
+{
+    Task<(string AccessToken, string RefreshToken, DateTime RefreshTokenExpiresAt)> GenerateTokensAsync(User user, IList<string> roles);
+    Task<Guid?> ValidateRefreshTokenAsync(string userId, string refreshToken);
+}