feat: initial implementation of modern modular webshop (shop core)

shop/app/admin/layout.tsx

@@ -0,0 +1,57 @@
+import Link from 'next/link'
+import { LayoutDashboard, Package, Settings, Users, LogOut } from 'lucide-react'
+
+export default function AdminLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return (
+    <div className="flex min-h-screen bg-[#020617] text-white">
+      {/* Sidebar */}
+      <aside className="w-64 border-r border-white/5 bg-black/20 backdrop-blur-xl flex flex-col">
+        <div className="p-6">
+          <Link href="/" className="flex items-center gap-2">
+            <div className="w-8 h-8 bg-primary rounded-lg flex items-center justify-center">
+              <Package className="h-5 w-5 text-white" />
+            </div>
+            <span className="font-bold text-xl tracking-tighter">Admin Panel</span>
+          </Link>
+        </div>
+        
+        <nav className="flex-1 px-4 space-y-2 py-4">
+          <Link href="/admin" className="flex items-center gap-3 px-3 py-2 rounded-lg text-slate-400 hover:text-white hover:bg-white/5 transition-all">
+            <LayoutDashboard className="w-5 h-5" />
+            Dashboard
+          </Link>
+          <Link href="/admin/products" className="flex items-center gap-3 px-3 py-2 rounded-lg bg-primary/10 text-primary border border-primary/20">
+            <Package className="w-5 h-5" />
+            Produkte
+          </Link>
+          <Link href="/admin/orders" className="flex items-center gap-3 px-3 py-2 rounded-lg text-slate-400 hover:text-white hover:bg-white/5 transition-all">
+            <Users className="w-5 h-5" />
+            Bestellungen
+          </Link>
+          <Link href="/admin/settings" className="flex items-center gap-3 px-3 py-2 rounded-lg text-slate-400 hover:text-white hover:bg-white/5 transition-all">
+            <Settings className="w-5 h-5" />
+            Einstellungen
+          </Link>
+        </nav>
+
+        <div className="p-4 border-t border-white/5">
+          <button className="flex w-full items-center gap-3 px-3 py-2 rounded-lg text-slate-400 hover:text-white hover:bg-white/5 transition-all">
+            <LogOut className="w-5 h-5" />
+            Abmelden
+          </button>
+        </div>
+      </aside>
+
+      {/* Main Content */}
+      <main className="flex-1 overflow-auto">
+        <div className="container mx-auto max-w-7xl">
+          {children}
+        </div>
+      </main>
+    </div>
+  )
+}