feat: shared link list (#14200)

#### PR Dependency Tree


* **PR #14200** 👈

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

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## Summary by CodeRabbit

## Release Notes

* **New Features**
* Added a "Shared Links" panel to workspace management, enabling admins
to view all published documents within a workspace
* Added publication date tracking for published documents, now displayed
alongside shared links

* **Chores**
  * Removed deprecated `publicPages` field; use `publicDocs` instead

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packages/backend/server/schema.prisma

@@ -158,6 +158,7 @@ model WorkspaceDoc {
   blocked     Boolean @default(false)
   title       String? @db.VarChar
   summary     String? @db.VarChar
+  publishedAt DateTime? @map("published_at") @db.Timestamptz(3)
 
   workspace Workspace @relation(fields: [workspaceId], references: [id], onDelete: Cascade)