feat(admin): add user account management

apps/web/src/lib/auth/require-admin.ts

@@ -0,0 +1,14 @@
+import { getServerSession } from "next-auth";
+import { redirect } from "next/navigation";
+import { adminAuthOptions, requiredAdminRole } from "./admin-auth";
+
+export async function requireAdminSession() {
+  const session = await getServerSession(adminAuthOptions);
+  const roles = (session?.user as { roles?: string[] } | undefined)?.roles ?? [];
+  if (!session || !roles.includes(requiredAdminRole)) redirect("/admin/login");
+
+  return {
+    email: session.user?.email ?? null,
+    name: session.user?.name ?? null,
+  };
+}