[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>

fe-admin/src/components/Layout.tsx

@@ -0,0 +1,63 @@
+import { Link, NavLink, Outlet } from 'react-router-dom'
+import { LogOut, LayoutDashboard, FileText, Users, Building2, Settings } from 'lucide-react'
+import { useAuth } from '@/contexts/AuthContext'
+import { cn } from '@/lib/cn'
+
+const menuItems = [
+  { to: '/dashboard', label: 'Tổng quan', icon: LayoutDashboard },
+  { to: '/contracts', label: 'Hợp đồng', icon: FileText },
+  { to: '/suppliers', label: 'Nhà cung cấp', icon: Building2 },
+  { to: '/users', label: 'Người dùng', icon: Users },
+  { to: '/settings', label: 'Cài đặt', icon: Settings },
+]
+
+export function Layout() {
+  const { user, logout } = useAuth()
+
+  return (
+    <div className="flex h-screen">
+      <aside className="flex w-64 flex-col border-r border-slate-200 bg-white">
+        <div className="flex h-14 items-center border-b border-slate-200 px-6">
+          <Link to="/dashboard" className="text-base font-bold text-brand-700">
+            SOLUTION ERP · Admin
+          </Link>
+        </div>
+        <nav className="flex-1 space-y-1 p-3">
+          {menuItems.map(item => (
+            <NavLink
+              key={item.to}
+              to={item.to}
+              className={({ isActive }) =>
+                cn(
+                  'flex items-center gap-3 rounded-md px-3 py-2 text-sm font-medium transition',
+                  isActive
+                    ? 'bg-brand-50 text-brand-700'
+                    : 'text-slate-600 hover:bg-slate-100 hover:text-slate-900',
+                )
+              }
+            >
+              <item.icon className="h-4 w-4" />
+              {item.label}
+            </NavLink>
+          ))}
+        </nav>
+        <div className="border-t border-slate-200 p-3">
+          <div className="mb-2 px-3 text-xs text-slate-500">
+            <div className="font-medium text-slate-700">{user?.fullName}</div>
+            <div className="truncate">{user?.email}</div>
+          </div>
+          <button
+            onClick={logout}
+            className="flex w-full items-center gap-2 rounded-md px-3 py-2 text-sm text-slate-600 transition hover:bg-slate-100"
+          >
+            <LogOut className="h-4 w-4" />
+            Đăng xuất
+          </button>
+        </div>
+      </aside>
+      <main className="flex-1 overflow-auto">
+        <Outlet />
+      </main>
+    </div>
+  )
+}