feat(server): comment model (#12760)

close CLOUD-226

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

- **New Features**
- Introduced support for comments and replies within workspaces and
documents, enabling users to create, update, delete, and resolve
comments, as well as manage threaded replies.
- **Bug Fixes**
- Added user-friendly error messages and handling for situations where
comments or replies are not found.
- **Tests**
- Added comprehensive tests to ensure correct behavior of comment and
reply operations.
- **Localization**
  - Added English translations for new comment and reply error messages.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->














#### PR Dependency Tree


* **PR #12760** 👈
  * **PR #12909**
    * **PR #12911**
      * **PR #12761**
        * **PR #12924**
          * **PR #12925**

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

packages/backend/server/src/base/error/def.ts

@@ -907,4 +907,14 @@ export const USER_FRIENDLY_ERRORS = {
     args: { reason: 'string' },
     message: ({ reason }) => `Invalid indexer input: ${reason}`,
   },
+
+  // comment and reply errors
+  comment_not_found: {
+    type: 'resource_not_found',
+    message: 'Comment not found.',
+  },
+  reply_not_found: {
+    type: 'resource_not_found',
+    message: 'Reply not found.',
+  },
 } satisfies Record<string, UserFriendlyErrorOptions>;