chore: solidify guide P1 snapshot

src/services/navAssets.ts

@@ -1,7 +1,5 @@
 export const NAV_ASSET_BASE_URL = '/static/nav-assets/app_nav_assets_v2_clean_20260609_075339'
 
-export const NAV_ROUTE_GRAPH_READY = false
-
 export const NAV_ROUTE_UNAVAILABLE_MESSAGE = '正式路线数据尚未接入，可先查看馆内三维位置'
 
 export interface NavFloorOption {
@@ -55,9 +53,9 @@ const searchableCategories = new Set([
   'operation_experience'
 ])
 
-let poiCache: CleanNavPoi[] | null = null
-
 const normalizeBaseUrl = (baseUrl: string) => baseUrl.replace(/\/+$/, '')
+const poiCache = new Map<string, CleanNavPoi[]>()
+const poiRequestCache = new Map<string, Promise<CleanNavPoi[]>>()
 
 export const navAssetUrl = (relativePath: string, baseUrl = NAV_ASSET_BASE_URL) => (
   `${normalizeBaseUrl(baseUrl)}/${relativePath.replace(/^\/+/, '')}`
@@ -106,15 +104,29 @@ const requestJson = <T>(url: string): Promise<T> => new Promise((resolve, reject
 })
 
 export const loadCleanNavPois = async (baseUrl = NAV_ASSET_BASE_URL) => {
-  if (poiCache) return poiCache
+  const cacheKey = normalizeBaseUrl(baseUrl)
+  const cachedPois = poiCache.get(cacheKey)
+  if (cachedPois) return cachedPois
 
-  const data = await requestJson<CleanPoiIndex>(navAssetUrl('data/poi_all.json', baseUrl))
-  if (data.status !== 'pass') {
-    throw new Error('导览 POI 数据状态不是 pass')
-  }
+  const pendingPois = poiRequestCache.get(cacheKey)
+  if (pendingPois) return pendingPois
 
-  poiCache = data.pois.filter((poi) => searchableCategories.has(poi.primaryCategory))
-  return poiCache
+  const request = requestJson<CleanPoiIndex>(navAssetUrl('data/poi_all.json', cacheKey))
+    .then((data) => {
+      if (data.status !== 'pass') {
+        throw new Error('导览 POI 数据状态不是 pass')
+      }
+
+      const pois = data.pois.filter((poi) => searchableCategories.has(poi.primaryCategory))
+      poiCache.set(cacheKey, pois)
+      return pois
+    })
+    .finally(() => {
+      poiRequestCache.delete(cacheKey)
+    })
+
+  poiRequestCache.set(cacheKey, request)
+  return request
 }
 
 export const loadCleanNavPoiById = async (id: string, baseUrl = NAV_ASSET_BASE_URL) => {