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/models/doc.ts

@@ -558,6 +558,8 @@ export class DocModel extends BaseModel {
         mode: PublicDocMode;
         public: boolean;
         defaultRole: DocRole;
+        title: string | null;
+        summary: string | null;
         createdAt: Date;
         updatedAt: Date;
         creatorId?: string;
@@ -570,6 +572,8 @@ export class DocModel extends BaseModel {
      "workspace_pages"."mode" as "mode",
      "workspace_pages"."public" as "public",
      "workspace_pages"."defaultRole" as "defaultRole",
+     "workspace_pages"."title" as "title",
+     "workspace_pages"."summary" as "summary",
      "snapshots"."created_at" as "createdAt",
      "snapshots"."updated_at" as "updatedAt",
      "snapshots"."created_by" as "creatorId",