feat: admin panel — dashboard, articles list, editor, auth, cover regen, AI generate

lib/adminAuth.js

@@ -0,0 +1,20 @@
+import { cookies } from 'next/headers';
+
+const SESSION_COOKIE = 'zp_admin_session';
+const VALID_TOKEN = process.env.ADMIN_PASSWORD || 'zeropost_admin_2026';
+
+export async function checkAdminAuth() {
+  const jar = await cookies();
+  const token = jar.get(SESSION_COOKIE)?.value;
+  return token === VALID_TOKEN;
+}
+
+export async function requireAdminAuth() {
+  const ok = await checkAdminAuth();
+  if (!ok) {
+    const { redirect } = await import('next/navigation');
+    redirect('/admin/login');
+  }
+}
+
+export { SESSION_COOKIE, VALID_TOKEN };