0803d86e38
First registered user becomes admin automatically. Admins see a "Manage Users" button in the dashboard header that opens a new /admin page for listing, creating, and deleting users. Backend enforces admin-only access on /admin/* routes. Startup migration adds the is_admin column to existing SQLite databases. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>