Add page data delivery and publication guards

public/assets/page-data-client.js

@@ -6,6 +6,23 @@
     return base.replace(/\/$/, '');
   }
 
+  function resolvePageId(options) {
+    options = options || {};
+    var explicit = options.pageId != null ? String(options.pageId).trim() : '';
+    if (explicit && explicit !== 'PLACEHOLDER_PAGE_ID') return explicit;
+    if (typeof document !== 'undefined') {
+      var meta = document.querySelector('meta[name="mindspace-page-data-page-id"]');
+      if (meta && meta.content) {
+        var fromMeta = String(meta.content).trim();
+        if (fromMeta) return fromMeta;
+      }
+    }
+    if (global.__MINDSPACE_PAGE_DATA__ && global.__MINDSPACE_PAGE_DATA__.pageId) {
+      return String(global.__MINDSPACE_PAGE_DATA__.pageId).trim();
+    }
+    return explicit || null;
+  }
+
   function buildAuthPath(apiBase, pageId) {
     return normalizeApiBase(apiBase) + '/public/pages/' + encodeURIComponent(String(pageId || '').trim()) + '/data-auth';
   }
@@ -41,11 +58,13 @@
 
   function createClient(options) {
     options = options || {};
-    var pageId = options.pageId;
+    var pageId = resolvePageId(options);
     var apiBase = options.apiBase || '/api';
     var fetchImpl = options.fetchImpl || global.fetch;
     var sessionToken = options.token || null;
-    if (!pageId) throw new Error('pageId 不能为空');
+    if (!pageId) {
+      throw new Error('pageId 未配置：请先发布页面，平台会在访问时注入 __MINDSPACE_PAGE_DATA__');
+    }
     if (typeof fetchImpl !== 'function') throw new Error('fetch 不可用');
 
     async function request(method, path, opts) {
@@ -111,6 +130,7 @@
 
   global.MindSpacePageData = {
     createClient: createClient,
+    resolvePageId: resolvePageId,
     buildAuthPath: buildAuthPath,
     buildDataPath: buildDataPath,
   };