fix: edit user modal empty fields (key prop); refactor: sidebar concept A — by work role

Sidebar: 6 groups by daily work role instead of mixed functionality
- Фронт-деск: calendar, bookings, guests, pos, room-service, reviews
- Номерной фонд: rooms, categories, availability, floor-map, housekeeping, tech tasks
- Продажи: tariffs, pricing, discounts, rental, channels, website, widget
- Аналитика: reports, loyalty
- Персонал: users, schedule, documents
- Настройки: settings, modules, billing, equipment, wifi, ttlock, sub-settings
Removed: separate 'Разработчикам' group (API docs moved to Настройки)
Removed: stale localStorage key sidebarGroups_v2 → v3
Fixed: dynamic modules (pos, room-service, etc) placed in logical groups instead of dumped in 'Сервис'
Fixed: UserModal key prop — form now resets correctly when switching between employees

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/UsersPage.tsx

@@ -1107,6 +1107,7 @@ export function UsersPage() {
 
           {/* User modal */}
           <UserModal
+            key={editing?.id ?? 'new'}
             open={modalOpen}
             user={editing}
             onClose={() => setModalOpen(false)}