feat: add comments functionality and integrate Socket.io for real-time updates

- Implemented a full comments module in the backend with repository, service, controller, and DTOs using NestJS.
- Added frontend support for comments with a `CommentSection` component and integration into content pages.
- Introduced `SocketProvider` on the frontend and integrated Socket.io for real-time communication.
- Updated dependencies and configurations for Socket.io and WebSockets support.

backend/src/database/schemas/index.ts

@@ -1,11 +1,13 @@
 export * from "./api_keys";
 export * from "./audit_logs";
 export * from "./categories";
+export * from "./comments";
 export * from "./content";
 export * from "./favorites";
 export * from "./pgp";
 export * from "./rbac";
 export * from "./reports";
+export * from "./messages";
 export * from "./sessions";
 export * from "./tags";
 export * from "./users";