fix: cdn.hotelsync.ru nginx config + RoomModal key for state reset

- Add cdn.hotelsync.ru server block to nginx config (serves /var/www/uploads)
- Add cdn.hotelsync.ru to HTTP redirect server_name
- RoomModal: add key={editingRoom?.id ?? 'new'} to force state reinit on room change
- RoomModal: remove categories[0] fallback for categoryId (show 'Без категории' instead)

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

src/components/rooms/RoomModal.tsx

@@ -70,7 +70,7 @@ export function RoomModal({ open, room, categories = [], onClose, onSave, onDele
     sortOrder:          room?.sortOrder          ?? 99,
     allowHourly:        room?.allowHourly        ?? false,
     hourlyRate:         room?.hourlyRate         ?? 1000,
-    categoryId:         room?.categoryId         ?? (categories.find(c => c.name === room?.type)?.id ?? categories[0]?.id ?? ''),
+    categoryId:         room?.categoryId         ?? (categories.find(c => c.name === room?.type)?.id ?? ''),
     description:        room?.description        ?? '',
     earlyCheckinFee:    room?.earlyCheckinFee    ?? '',
     lateCheckoutFee:    room?.lateCheckoutFee    ?? '',