feat: implement admin validation middleware, DB integrity scan, automatic schema repair, and reindexing dashboard

shop/lib/actions/auth.ts

@@ -98,3 +98,20 @@ export async function updatePassword(password: string) {
   }
   return { success: true }
 }
+
+export async function verifyAdmin() {
+  const supabase = await createClient()
+  const { data: { user } } = await supabase.auth.getUser()
+  if (!user) throw new Error("Nicht authentifiziert.")
+
+  const { data: userData, error } = await supabase
+    .from('users')
+    .select('role')
+    .eq('id', user.id)
+    .single()
+
+  if (error || !userData || userData.role !== 'admin') {
+    throw new Error("Zugriff verweigert. Nur Administratoren erlaubt.")
+  }
+  return user
+}