feat(chatelet): photo gallery and house rules on the room page

Swap the single hero image for the shared ImageViewer (thumbnails,
lightbox and cycle controls when a room has more than one photo, as the
marketplace product page does) and add a 'Things to know' card: check-in
from / check-out by, guest cap, minimum stay and the cancellation policy.
The rules come from the room owner's operator settings (chatelet ≥ v0.5.0)
so the card only renders when the extension sends them.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/modules/chatelet/types/room.ts

@@ -2,6 +2,13 @@
 // Note: operator-private fields (wallet, checkin_instructions) are stripped
 // server-side by public_room_dict and never reach the client.
 
+/** The room owner's rules, from their operator settings (chatelet ≥ v0.5.0). */
+export interface HouseRules {
+  checkin_time: string
+  checkout_time: string
+  cancellation_policy: string
+}
+
 export interface Room {
   id: string
   title: string
@@ -19,6 +26,10 @@ export interface Room {
   listing_event_id: string | null
   created_at: string
   updated_at: string
+  /** Absent on chatelet < v0.5.0. */
+  house_rules?: HouseRules
+  /** Rails the owner accepts for this room: 'lightning' and maybe 'fiat'. Absent on < v0.5.0. */
+  payment_methods?: string[]
 }
 
 export interface AvailabilityResult {

src/modules/chatelet/views/ChateletDetailPage.vue

@@ -3,10 +3,11 @@ import { computed, onMounted, ref, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { toast } from 'vue-sonner'
 import { watchDebounced } from '@vueuse/core'
-import { MapPin, Users } from 'lucide-vue-next'
+import { Clock, MapPin, Moon, Users } from 'lucide-vue-next'
 import { Card, CardContent } from '@/components/ui/card'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
+import { ImageViewer } from '@/components/ui/image'
 import { formatSats } from '@/lib/utils/formatting'
 import { useAuth } from '@/composables/useAuthService'
 import { useChatelet } from '../composables/useChatelet'
@@ -129,11 +130,18 @@ watch(showBooking, (open) => {
     <div v-else-if="!room" class="text-muted-foreground py-12">Room not found.</div>
 
     <div v-else class="space-y-4">
-      <img
+      <!-- Gallery: thumbnails + lightbox when there is more than one photo
+           (same ImageViewer the marketplace product page uses). -->
+      <ImageViewer
         v-if="room.images?.length"
-        :src="room.images[0]"
+        :images="room.images"
         :alt="room.title"
-        class="w-full h-56 object-cover rounded-lg"
+        container-class="aspect-[4/3] sm:aspect-video rounded-lg overflow-hidden bg-muted"
+        image-class="w-full h-full object-cover"
+        :show-thumbnails="room.images.length > 1"
+        :show-lightbox="true"
+        :show-badge="room.images.length > 1"
+        :show-cycle-controls="room.images.length > 1"
       />
 
       <div>
@@ -161,6 +169,35 @@ watch(showBooking, (open) => {
         {{ room.description }}
       </p>
 
+      <!-- House rules come from the room owner's operator settings; older
+           extensions don't send them, so the card is conditional. -->
+      <Card v-if="room.house_rules">
+        <CardContent class="p-4 space-y-2">
+          <h2 class="font-semibold text-foreground">Things to know</h2>
+          <ul class="text-sm text-muted-foreground space-y-1">
+            <li class="flex items-center gap-2">
+              <Clock class="h-4 w-4 shrink-0" />
+              Check-in from {{ room.house_rules.checkin_time }} · check-out by
+              {{ room.house_rules.checkout_time }}
+            </li>
+            <li class="flex items-center gap-2">
+              <Users class="h-4 w-4 shrink-0" />
+              Up to {{ room.max_guests }} guest{{ room.max_guests === 1 ? '' : 's' }}
+            </li>
+            <li class="flex items-center gap-2">
+              <Moon class="h-4 w-4 shrink-0" />
+              Minimum stay {{ room.min_nights }} night{{ room.min_nights === 1 ? '' : 's' }}
+            </li>
+          </ul>
+          <div v-if="room.house_rules.cancellation_policy" class="pt-1">
+            <p class="text-sm font-medium text-foreground">Cancellation policy</p>
+            <p class="text-sm text-muted-foreground whitespace-pre-line">
+              {{ room.house_rules.cancellation_policy }}
+            </p>
+          </div>
+        </CardContent>
+      </Card>
+
       <Card>
         <CardContent class="p-4 space-y-4">
           <StayDatePicker