fix: MindSpace remote sync, thumbnail fallback, and Plaza URL guards

Ensure page sync runs via pageSyncService in remote mode, fall back to
workspace HTML when storage assets are missing, and prevent production
Portal from linking to loopback Plaza URLs baked in at build time.

Co-authored-by: Cursor <cursoragent@cursor.com>

server.mjs

@@ -122,7 +122,6 @@ import {
   normalizePublicHtmlRelativePath,
   syncPublicHtmlAfterFinish,
 } from './mindspace-public-finish-sync.mjs';
-import { syncGeneratedPagesFromPublicAssets } from './mindspace-page-sync.mjs';
 import { extractCoverSignals, generateHtmlThumbnail } from './mindspace-thumbnails.mjs';
 import {
   extractSharePreviewMeta,
@@ -299,6 +298,7 @@ let mindSpaceAudit = null;
 let mindSpaceServiceFacade = null;
 let mindSpaceConversationPackageRegistry = null;
 let mindSpacePages = null;
+let mindSpacePageSync = null;
 let mindSpacePageLiveEdit = null;
 let mindSpaceAssetAgent = null;
 let mindSpacePageEditSession = null;
@@ -363,6 +363,7 @@ async function bootstrapUserAuth() {
       resolveUserIdForAgentSession,
       resolveSessionSnapshot: (sessionId) => sessionSnapshotService?.get?.(sessionId),
       registerPublicHtmlArtifactsForConversation,
+      syncWorkspaceAssetsEnabled: WORKSPACE_MAINTENANCE_ENABLED,
       remote: mindSpaceServerRuntime.remote,
       logger: console,
     }),
@@ -372,6 +373,7 @@ async function bootstrapUserAuth() {
     mindSpaceConversationPackageRegistry = mindSpaceRuntimeAdapter.conversationPackageRegistry;
     mindSpaceAssets = mindSpaceRuntimeAdapter.assetService;
     mindSpacePages = mindSpaceRuntimeAdapter.pageService;
+    mindSpacePageSync = mindSpaceRuntimeAdapter.pageSyncService;
     mindSpacePageLiveEdit = mindSpaceRuntimeAdapter.pageLiveEditService;
     mindSpaceAssetAgent = mindSpaceRuntimeAdapter.assetAgentService;
     mindSpacePublications = mindSpaceRuntimeAdapter.publicationService;
@@ -2942,36 +2944,10 @@ async function resolveExistingSavedPage(userId, { sessionId, messageId, relative
 
 const SAVE_TARGET_CATEGORIES = new Set(['draft', 'oa', 'public']);
 
-const pageSyncInFlight = new Map();
-
+// REGRESSION GUARD: mindspace-page-sync-thumbnail — remote 也经 pageSyncService RPC 同步 public HTML
 async function syncUserGeneratedPages(userId) {
-  if (!mindSpacePages || !authPool || !userId) return;
-  if (mindSpaceServerRuntime.adapterKind === 'remote') return;
-
-  let inFlight = pageSyncInFlight.get(userId);
-  if (!inFlight) {
-    inFlight = syncGeneratedPagesFromPublicAssets({
-      pool: authPool,
-      pageService: mindSpacePages,
-      assetService: mindSpaceAssets,
-      userId,
-      publishDir: resolveMindSpaceUserPublishDir(__dirname, { id: userId }),
-      syncWorkspaceAssets:
-        mindSpaceAssets && WORKSPACE_MAINTENANCE_ENABLED
-          ? (targetUserId, options) => mindSpaceAssets.syncWorkspaceAssets(targetUserId, options)
-          : null,
-    })
-      .catch((error) => {
-        console.warn('[MindSpace] page sync failed:', error?.message ?? error);
-      })
-      .finally(() => {
-        if (pageSyncInFlight.get(userId) === inFlight) {
-          pageSyncInFlight.delete(userId);
-        }
-      });
-    pageSyncInFlight.set(userId, inFlight);
-  }
-  await inFlight;
+  if (!mindSpacePageSync || !userId) return;
+  await mindSpacePageSync.syncUserGeneratedPages(userId);
 }
 
 async function resolveChatSaveBundle(user, h5Root, input = {}) {