- Add admin layout with sidebar navigation and session guard
- Create AdminSidebar client component with role-based nav links
- Add dashboard page showing stats (admin count, code counts)
- Add users management page (SuperAdmin only): list, create, delete,
and reset passwords for admin users
- Add codes management page: list all codes, generate new codes,
delete unused codes
- Add API routes for admin user CRUD (GET, POST, DELETE, PUT)
- Add API routes for code management (GET, POST, DELETE)
- All UI in Macedonian
- Create admin-session lib with sign/verify helpers using HMAC-SHA256
- Add admin login API that checks hardcoded super/admin credentials
and DB-stored admin users with bcrypt password comparison
- Add admin logout API to clear session cookie
- Add change-password API for admin self-service password changes
- Create admin login page with Macedonian UI
- Update middleware to protect /admin/* and /api/admin/* routes
with admin session check, bypassing Clerk auth
