bf92b7a5e1
git commit -m "feat(workspace): inventory overview, auth, persistent h2 db, users & roles - add inventory overview endpoint (aggregated stock per SKU) - implement inventory movements (production, sale, return, adjustment) - add session-based login with Spring Security (form login) - protect /api/** endpoints - add logout with session invalidation - introduce user roles (ADMIN, WORKER) and active flag - seed admin user in dev profile - switch from H2 in-memory to persistent H2 file database - enable H2 console for development - add Next.js workspace UI (inventory table, filters, movements) - support active/inactive products and users (soft disable)"