feat(notebook): load notebook space via token and pre-select docs/sources

- NotebookAIWritingPage reads `token` from URL, fetches space data from
  notebook-token API (search_space_id, doc_ids, user_token) and space
  name from searchspaces API; keep-alive ping every 50s resets Redis TTL
- Pass user_token as studioToken through AIWritingPage → AIWritingLayout
  → WritingFormPanel → AIWritingPanel → AIWritingForm to skip
  getTokenByEmail when studio token is already available
- useStudioNotebooks accepts enabled flag; useNotebookSources accepts
  overrideToken to bypass the internal token fetch
- AIWritingForm hides notebook selector when studioToken is provided
  (notebook is pre-locked) and pre-selects initialDocumentIds

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend-web/src/pages/NotebookAIWritingPage.tsx

@@ -1,9 +1,59 @@
+import { useEffect, useState } from 'react';
 import { useSearchParams } from 'react-router-dom';
 import AIWritingPage from '@/open-canvas/pages/AIWritingPage';
+import { getNotebookApiBaseURL } from '@/core/config';
+
+interface NotebookTokenData {
+  doc_ids: number[];
+  search_space_id: number;
+  user_id: string;
+  user_token: string;
+}
 
 export default function NotebookAIWritingPage() {
   const [searchParams] = useSearchParams();
-  const notebookId = searchParams.get('notebook_id');
+  const token = searchParams.get('token');
+
+  const [data, setData] = useState<NotebookTokenData | null>(null);
+  const [spaceName, setSpaceName] = useState<string | null>(null);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    if (!token) {
+      setError('缺少 token 参数');
+      return;
+    }
+    const base = getNotebookApiBaseURL();
+    fetch(`${base}/api/v1/ai-writing/notebook-token/${token}`)
+      .then((res) => {
+        if (!res.ok) throw new Error(`请求失败 ${res.status}`);
+        return res.json() as Promise<NotebookTokenData>;
+      })
+      .then((d) => {
+        setData(d);
+        return fetch(`${base}/api/v1/searchspaces/${d.search_space_id}`, {
+          headers: { Authorization: `Bearer ${d.user_token}` },
+        });
+      })
+      .then((res) => {
+        if (!res.ok) return null;
+        return res.json() as Promise<{ name: string }>;
+      })
+      .then((space) => {
+        if (space?.name) setSpaceName(space.name);
+      })
+      .catch((e: Error) => setError(e.message));
+  }, [token]);
+
+  // Keep-alive：每 50 秒 ping 一次 token 接口，防止 Redis TTL 过期
+  useEffect(() => {
+    if (!token) return;
+    const base = getNotebookApiBaseURL();
+    const id = setInterval(() => {
+      fetch(`${base}/api/v1/ai-writing/notebook-token/${token}`).catch(() => {});
+    }, 50_000);
+    return () => clearInterval(id);
+  }, [token]);
 
   return (
     <div className="h-full flex flex-col overflow-hidden">
@@ -20,12 +70,12 @@ export default function NotebookAIWritingPage() {
         {/* 分隔线 */}
         <div className="w-px h-4 bg-[#2d4f7a]" />
 
-        {/* 空间 ID */}
-        {notebookId && (
+        {/* 空间名称 */}
+        {data?.search_space_id && (
           <div className="flex items-center gap-1.5">
             <span className="text-[#7fb3e8] text-xs">空间</span>
             <span className="text-[#b3d4f5] text-xs font-semibold bg-[#1a3a60] border border-[#2d5080] rounded px-2 py-0.5">
-              {notebookId}
+              {spaceName ?? data.search_space_id}
             </span>
           </div>
         )}
@@ -40,12 +90,20 @@ export default function NotebookAIWritingPage() {
         </div>
       </div>
 
-      {/* 主体：AIWritingPage 完整组件，含 context providers */}
+      {/* 主体 */}
       <div className="flex-1 min-h-0 overflow-hidden">
-        <AIWritingPage
-          hideAdvancedFields
-          initialNotebookId={notebookId ? Number(notebookId) : undefined}
-        />
+        {error ? (
+          <div className="flex items-center justify-center h-full text-red-400 text-sm">{error}</div>
+        ) : !data ? (
+          <div className="flex items-center justify-center h-full text-[#7fb3e8] text-sm">加载中…</div>
+        ) : (
+          <AIWritingPage
+            hideAdvancedFields
+            initialNotebookId={data.search_space_id}
+            initialDocumentIds={data.doc_ids}
+            studioToken={data.user_token}
+          />
+        )}
       </div>
     </div>
   );