RoundConfig gets a paused flag toggled via new POST /admin/pause and /admin/resume endpoints (audit-logged, surfaced as a "Manutenzione" card in the admin Parametri view). Pausing only stops the *next* round from opening once the current one closes — rounds/service.py:open_new_round_if_needed still lets an in-progress round finish, draw, and pay out its winner normally. GET /rounds/current exposes lottery_paused so the user page shows a maintenance banner (even while logged out) instead of silently going idle. Also replaces the user dashboard's stacked account-bar card + bento-grid menu with a single sticky navbar (identity row + Deposito/Bet/Prelievo tabs), and moves the page content into a dedicated .app-shell container so the navbar itself can span full width.
Generic single-database configuration with an async dbapi.