Add hotel registration flow on login page and staff users management page

LoginPage:
- Toggle between login and registration mode
- 2-step registration: step 1 (hotel name + legal entity: type ООО/ИП/АО/ПАО/Другое, company name, INN, KPP hidden for ИП, legal address), step 2 (first/last name, email, phone, password with strength indicator, confirm)
- Step indicator dots, validation with inline errors, success screen after submit
- Left panel shows benefits list when in registration mode
- «Зарегистрировать отель» / «Войти» toggle links

UsersPage (/users):
- Staff list table: avatar with custom color, name, role badge, position, contacts, last login, active status
- Roles: hotel_manager, receptionist, housekeeper, accountant, security — each with label+color
- Stats cards by role (clickable to filter)
- Search by name/email/position + role filter buttons
- UserModal: avatar color picker, name/email/phone, role selector (6 roles), position field with quick-pick suggestions per role, password field, active toggle
- Delete confirmation dialog
- Sidebar: «Сотрудники» link added to Управление section

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

src/components/layout/Sidebar.tsx

@@ -1,7 +1,7 @@
 import { NavLink, useNavigate } from 'react-router-dom'
 import {
   CalendarDays, BookOpen, BedDouble, Globe, Settings,
-  FileText, LayoutDashboard, Building2, Users, X, Hotel, Puzzle, CalendarRange, Map, LayoutGrid,
+  FileText, LayoutDashboard, Building2, Users, X, Hotel, Puzzle, CalendarRange, Map, LayoutGrid, UserCog,
 } from 'lucide-react'
 import { useAuth } from '../../contexts/AuthContext'
 import { useModules } from '../../contexts/ModulesContext'
@@ -156,7 +156,8 @@ export function Sidebar({ open, onClose }: SidebarProps) {
                   <p className="px-3 pt-3 pb-1 text-xs font-semibold text-slate-400 uppercase tracking-wider">
                     Управление
                   </p>
-                  <NavItem to="/floor-map" icon={Map} label="План этажей" onClick={onClose} />
+                  <NavItem to="/users"     icon={UserCog} label="Сотрудники"  onClick={onClose} />
+                  <NavItem to="/floor-map" icon={Map}     label="План этажей" onClick={onClose} />
                   {isModuleActive('channel-manager') && (
                     <NavItem
                       to="/channels"