feat(server): export title and summary on doc resolver (#13139)

close AF-2732






#### PR Dependency Tree


* **PR #13139** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added support for a document summary field, allowing documents to
include and display an optional summary alongside the title.

* **Bug Fixes**
* Improved access control when retrieving documents, ensuring proper
permission checks are enforced.

* **Tests**
* Expanded test coverage to verify correct handling of document title
and summary fields, including cases where the summary is absent.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/__tests__/models/doc.spec.ts

@@ -669,7 +669,10 @@ test('should get doc info', async t => {
   };
 
   await t.context.doc.upsert(snapshot);
-  await t.context.doc.upsertMeta(workspace.id, docId);
+  await t.context.doc.upsertMeta(workspace.id, docId, {
+    title: 'test title',
+    summary: 'test summary',
+  });
 
   const docInfo = await t.context.doc.getDocInfo(workspace.id, docId);
 
@@ -679,6 +682,8 @@ test('should get doc info', async t => {
     updatedAt: new Date(snapshot.timestamp),
     creatorId: user.id,
     lastUpdaterId: user.id,
+    title: 'test title',
+    summary: 'test summary',
   });
 });