feat: 临时改造讲解页方案 B 链路

接入展厅列表、展厅讲解点分组生成临时业务单元，并迁移讲解详情播放正文到新接口链路。

src/domain/museum.ts

@@ -165,10 +165,50 @@ export interface MuseumExhibit {
   audioNarrationTier?: 'STANDARD' | 'EXTENDED'
   audioUnavailableReason?: string
   audioAvailable?: boolean
+  audioStatus?: string
+  supportedLanguages?: string[]
+  imageStatus?: string
+  imageSource?: string
+  galleryUrls?: string[]
+  linkedExhibits?: Array<{
+    id: string
+    name: string
+    nameEn?: string
+    exhibitCode?: string
+    coverImageUrl?: string
+  }>
+  stopInfoAvailable?: boolean
+  stopInfoReason?: string
+  resolvedStopId?: string
   playTargetType?: AudioPlayTargetType
   playTargetId?: string
 }
 
+export interface ExplainGuideStop {
+  id: string
+  name: string
+  hallId?: string
+  hallName?: string
+  floorId?: string
+  targetType?: AudioPlayTargetType
+  targetId?: string
+  coverImageUrl?: string
+  description?: string
+  hasAudio?: boolean
+  poiId?: string
+  outlineId?: string
+  outlineName?: string
+  sort?: number
+}
+
+export interface ExplainBusinessUnit {
+  id: string
+  name: string
+  hallId: string
+  guideStopCount: number
+  stops: ExplainGuideStop[]
+}
+
 export interface GuideLocationPreview {
   poiId: string
   name: string