feat: add admin authentication and management features

- Implemented Prisma schema with models for AdminUser, AppSettings, and Snapshot.
- Created seed script to initialize the database with an admin user and JWT secret.
- Developed admin login page with form handling and error management.
- Added API routes for admin login, logout, change password, and JWT verification.
- Integrated Stripe for payment intent management in admin orders.
- Established middleware for protecting admin routes with JWT authentication.
- Created Zustand stores for managing persona and snapshot states.

next.config.mjs

@@ -1,6 +1,5 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
-  output: 'export',
   images: {
     unoptimized: true,
   },