ed7a7a5ce0
PR 4 of 4 for configurable dashboard widgets. - Replace hard-coded Jellyfin/Backups dashboard sections with a loop that renders enabled widget instances by sort_order. - Add WidgetInstance renderer and WidgetConfigDialog for adding, editing, enabling/disabling, deleting, and reordering widgets. - Add addon pages for grafana, prometheus, and ssh-tasks at /addons/:addonId. - Register /addons/:addonId route in App.tsx. - Update docs/REQUIREMENTS.md with the widget system design and API. Verification: - backend ruff clean; pytest 200 passed - frontend npm run lint: 0 errors - frontend npm run build: success - frontend npm run test -- src/widgets/registry.test.ts: 3 passed