feat: add category field to housekeeping tasks + TechnicalPage for maintenance tasks

- Add migration 025 to add `category` column (housekeeping/maintenance) to housekeeping_tasks
- Backend: filter by ?category= in GET, store category in POST, allow patching category
- API client: HkPayload + housekeeping.list() now support category param
- HousekeepingPage: filters by category=housekeeping so maintenance tasks don't appear
- RoomContextMenu: priority sub-form for dirty/cleaning status, tech task creation inline form
- BookingCalendar: accepts onMaintenanceTaskCreate prop, passes priority to onRoomUpdate
- CalendarPage: handleRoomUpdate creates task for dirty+cleaning (with priority), new handleMaintenanceTaskCreate for category=maintenance tasks
- TechnicalPage: new page for viewing/creating/updating maintenance tasks
- App.tsx: /technical route added
- Sidebar: Тех. задачи nav item added under Управление

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

src/App.tsx

@@ -38,6 +38,7 @@ import { GuestReviewPage } from './pages/GuestReviewPage'
 import { GuestRoomServicePage } from './pages/GuestRoomServicePage'
 import { ResetPasswordPage } from './pages/ResetPasswordPage'
 import { TvWelcomePage } from './pages/TvWelcomePage'
+import { TechnicalPage } from './pages/TechnicalPage'
 
 export default function App() {
   return (
@@ -85,6 +86,7 @@ export default function App() {
                 <Route path="/maintenance"     element={<MaintenancePage />} />
                 <Route path="/discounts"       element={<DiscountsPage />} />
                 <Route path="/tv-welcome"     element={<TvWelcomePage />} />
+                <Route path="/technical"      element={<TechnicalPage />} />
               </Route>
 
               <Route path="/" element={<Navigate to="/login" replace />} />