feat: add full CRUD management for product categories in admin panel

shop/app/admin/categories/page.tsx

@@ -0,0 +1,46 @@
+import { getCategories } from '@/lib/actions/products'
+import { CategoryList } from '@/components/admin/category-list'
+import { CategoryDialog } from '@/components/admin/category-dialog'
+import { LayoutGrid, Plus } from 'lucide-react'
+import { Suspense } from 'react'
+
+export default async function AdminCategoriesPage() {
+  return (
+    <div className="flex-1 space-y-8 p-8 pt-6">
+      <div className="flex items-center justify-between space-y-2">
+        <div>
+          <h2 className="text-3xl font-bold tracking-tight text-gradient flex items-center gap-3">
+            <LayoutGrid className="w-8 h-8 text-primary" />
+            Kategorien
+          </h2>
+          <p className="text-muted-foreground">
+            Verwalten Sie die Struktur Ihres Webshops.
+          </p>
+        </div>
+        <div className="flex items-center space-x-2">
+          <Suspense fallback={<div className="h-10 w-32 animate-pulse bg-white/5 rounded-md" />}>
+            <CreateCategoryAction />
+          </Suspense>
+        </div>
+      </div>
+      <Suspense fallback={<div className="h-40 w-full animate-pulse bg-white/5 rounded-xl" />}>
+        <CategoryDataWrapper />
+      </Suspense>
+    </div>
+  )
+}
+
+async function CategoryDataWrapper() {
+  const categories = await getCategories()
+  return <CategoryList initialCategories={categories} />
+}
+
+async function CreateCategoryAction() {
+  return (
+    <CategoryDialog>
+      <button className="inline-flex items-center justify-center rounded-md bg-primary px-4 py-2 text-sm font-medium text-primary-foreground shadow transition-colors hover:bg-primary/90 focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50">
+        <Plus className="mr-2 h-4 w-4" /> Kategorie hinzufügen
+      </button>
+    </CategoryDialog>
+  )
+}