feat: emergency room closure for urgent maintenance tasks

- Backend housekeeping POST: when priority=urgent + category=maintenance + room_id
  → auto sets room status=maintenance with maintenance_from/to dates
  → closes room for emergency_close_days (default 1 day)
  → broadcasts room_updated WS event
- housekeeping-settings: add emergency_close_days column (migration 030, default 1)
- TechnicalPage: rename "Срочно" → "Экстренно!", show "🔒 Номер закрыт" badge for urgent active tasks
- HousekeepingPage plans tab: new "Экстренное закрытие номера" setting with day picker (1/2/3/5/7/14 days)
- api.ts HkSettings: add emergency_close_days field

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

src/pages/TechnicalPage.tsx

@@ -25,9 +25,9 @@ function normalizeTask(raw: Record<string, unknown>): Record<string, unknown> {
 }
 
 const PRIORITY_LABELS: Record<string, { label: string; color: string }> = {
-  urgent: { label: 'Срочно',  color: 'text-red-600 bg-red-50 dark:bg-red-900/20 dark:text-red-400 border border-red-200 dark:border-red-800' },
-  medium: { label: 'Средний', color: 'text-yellow-600 bg-yellow-50 dark:bg-yellow-900/20 dark:text-yellow-400 border border-yellow-200 dark:border-yellow-800' },
-  low:    { label: 'Низкий',  color: 'text-slate-500 bg-slate-100 dark:bg-slate-700 dark:text-slate-400 border border-slate-200 dark:border-slate-600' },
+  urgent: { label: 'Экстренно!', color: 'text-red-600 bg-red-50 dark:bg-red-900/20 dark:text-red-400 border border-red-200 dark:border-red-800' },
+  medium: { label: 'Средний',    color: 'text-yellow-600 bg-yellow-50 dark:bg-yellow-900/20 dark:text-yellow-400 border border-yellow-200 dark:border-yellow-800' },
+  low:    { label: 'Низкий',     color: 'text-slate-500 bg-slate-100 dark:bg-slate-700 dark:text-slate-400 border border-slate-200 dark:border-slate-600' },
 }
 
 const STATUS_LABELS: Record<string, { label: string; icon: React.ElementType; color: string }> = {
@@ -217,6 +217,11 @@ export function TechnicalPage() {
                     )}>
                       {sMeta.label}
                     </span>
+                    {String(taskRecord.priority) === 'urgent' && !isDone && (taskRecord.roomNumber || taskRecord.room_number) && (
+                      <span className="text-[11px] font-medium px-1.5 py-0.5 rounded-md shrink-0 bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-300 border border-red-200 dark:border-red-700">
+                        🔒 Номер закрыт
+                      </span>
+                    )}
                   </div>
                   <div className="flex items-center gap-3 mt-1.5 text-xs text-slate-500 dark:text-slate-400 flex-wrap">
                     <span className="font-medium text-slate-700 dark:text-slate-300">{roomLabel}</span>