feat: add WiFi authorization module

- Backend: hotel_wifi_settings table (migration 046), CRUD routes
- Public API endpoint /api/wifi-auth/verify for captive portal
- Auth methods: room+lastname, room+birthdate, room+any, room_only
- Frontend: WiFiPage with settings, token management, setup guide
- Guide tabs: MikroTik, UniFi, Universal with copy-paste instructions
- Sidebar: WiFi item in Settings group

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

src/App.tsx

@@ -42,6 +42,7 @@ import { TechnicalPage } from './pages/TechnicalPage'
 import { SchedulePage } from './pages/SchedulePage'
 import { BillingPage } from './pages/BillingPage'
 import { EquipmentPage } from './pages/EquipmentPage'
+import { WiFiPage } from './pages/WiFiPage'
 import { ModuleGuard } from './components/ModuleGuard'
 
 export default function App() {
@@ -94,6 +95,7 @@ export default function App() {
                 <Route path="/technical"      element={<TechnicalPage />} />
                 <Route path="/billing"        element={<BillingPage />} />
                 <Route path="/equipment"      element={<EquipmentPage />} />
+                <Route path="/wifi"           element={<WiFiPage />} />
               </Route>
 
               <Route path="/" element={<Navigate to="/login" replace />} />