- Add ListQuickAddItems, CreateQuickAddItem, UpdateQuickAddItem, DeleteQuickAddItem handler methods
- Register GET/POST /api/quick-add and PUT/DELETE /api/quick-add/{itemId} in authenticated route group
- Validate name non-empty on create and update; return 404 on update when item not found
- Add /api/template route group: GET, PUT /, POST/PUT/DELETE items, PUT items/reorder
- Add POST /api/budgets/generate before /{id} routes to avoid chi treating 'generate' as an id param
- /items/reorder registered before /items/{itemId} for correct static-before-param routing
