修复 SGS SDK 导览数据源与模型加载

升级 SDK API 数据契约，补齐 guideStops、业务 POI、诊断与路线数据接口。

修复 SDK 模式下 POI/模型/楼层混用静态数据的问题，并为 ThreeMap 模型加载增加短退避重试。

src/components/map/ThreeMap.vue

@@ -350,6 +350,7 @@ const floorExitConfirmThresholdMultiplier = 1.34
 const floorExitZoomOutIntentMinDeltaRatio = 0.015
 const floorExitAccumulatedZoomOutRatio = 0.26
 const floorExitCandidateHoldMs = 900
+const modelLoadRetryDelaysMs = [300, 900]
 
 const syncControlInteractionOptions = () => {
   if (!controls) return
@@ -2165,7 +2166,11 @@ const clearSceneData = () => {
   clearPoiGroupChildren()
 }
 
-const loadModel = (
+const wait = (delayMs: number) => new Promise<void>((resolve) => {
+  window.setTimeout(resolve, delayMs)
+})
+
+const loadModelOnce = (
   url: string,
   label: string,
   loadToken?: number,
@@ -2193,6 +2198,41 @@ const loadModel = (
   )
 })
 
+const loadModel = async (
+  url: string,
+  label: string,
+  loadToken?: number,
+  options: LoadModelOptions = {}
+) => {
+  let lastError: unknown = null
+
+  for (let attempt = 0; attempt <= modelLoadRetryDelaysMs.length; attempt += 1) {
+    if (loadToken !== undefined && !isCurrentModelLoad(loadToken)) {
+      throw createStaleModelLoadError()
+    }
+
+    try {
+      return await loadModelOnce(url, label, loadToken, options)
+    } catch (error) {
+      if (loadToken !== undefined && !isCurrentModelLoad(loadToken)) {
+        throw createStaleModelLoadError()
+      }
+
+      lastError = error
+      const retryDelay = modelLoadRetryDelaysMs[attempt]
+      if (retryDelay === undefined) break
+
+      if (!options.suppressProgress) {
+        setProgress(18, `${label} 加载失败，正在重试 ${attempt + 1}/${modelLoadRetryDelaysMs.length}`)
+      }
+
+      await wait(retryDelay)
+    }
+  }
+
+  throw lastError instanceof Error ? lastError : new Error('模型资源加载失败')
+}
+
 const prepareModel = (model: THREE.Object3D) => {
   model.traverse((child) => {
     if (child instanceof THREE.Mesh) {