Gate setup and admin navigation

src/lib/setup.ts

@@ -0,0 +1,20 @@
+import { redirect } from "next/navigation";
+import { prisma } from "./prisma";
+
+export async function hasAdminUser() {
+  try {
+    const admin = await prisma.userRole.findFirst({
+      where: { role: { name: "admin" } },
+      select: { userId: true }
+    });
+    return Boolean(admin);
+  } catch {
+    return false;
+  }
+}
+
+export async function requireInitialSetup() {
+  if (!(await hasAdminUser())) {
+    redirect("/setup");
+  }
+}