Add admin portal

apps/frontend/src/features/admin/admin-layout.tsx

@@ -0,0 +1,68 @@
+import { Button } from '@/components/ui/button';
+import { Link } from '@tanstack/react-router';
+import { BarChart3, Building2, Home, LayoutDashboard, Shield, Users } from 'lucide-react';
+import type { ReactNode } from 'react';
+
+type NavItem = {
+  label: string;
+  href: string;
+  icon: ReactNode;
+};
+
+const navItems: NavItem[] = [
+  { label: 'Dashboard', href: '/admin', icon: <LayoutDashboard className="size-4" /> },
+  { label: 'Complejos', href: '/admin/complexes', icon: <Building2 className="size-4" /> },
+  { label: 'Planes', href: '/admin/plans', icon: <BarChart3 className="size-4" /> },
+  { label: 'Usuarios', href: '/admin/users', icon: <Users className="size-4" /> },
+];
+
+interface AdminLayoutProps {
+  children: ReactNode;
+  currentPath: string;
+}
+
+export function AdminLayout({ children, currentPath }: AdminLayoutProps) {
+  return (
+    <div className="flex min-h-[calc(100dvh-4rem)] gap-0">
+      <aside className="hidden w-56 shrink-0 border-r border-border/60 md:block">
+        <nav className="sticky top-20 flex flex-col gap-1 p-4">
+          <div className="mb-4 flex items-center gap-2 px-3">
+            <Shield className="size-4 text-emerald-600" />
+            <span className="text-xs font-semibold uppercase tracking-wider text-muted-foreground">
+              Admin
+            </span>
+          </div>
+
+          {navItems.map((item) => {
+            const isActive = currentPath === item.href;
+
+            return (
+              <Button
+                key={item.href}
+                variant={isActive ? 'secondary' : 'ghost'}
+                className="justify-start gap-3 rounded-xl"
+                asChild
+              >
+                <Link to={item.href}>
+                  {item.icon}
+                  {item.label}
+                </Link>
+              </Button>
+            );
+          })}
+
+          <div className="mt-6 border-t border-border/60 pt-4">
+            <Button variant="ghost" className="w-full justify-start gap-3 rounded-xl" asChild>
+              <Link to="/">
+                <Home className="size-4" />
+                Volver a Playzer
+              </Link>
+            </Button>
+          </div>
+        </nav>
+      </aside>
+
+      <div className="flex-1 overflow-hidden p-4 sm:p-6 lg:p-8">{children}</div>
+    </div>
+  );
+}