feat: Implement discussion forum with moderation queue

[AbuJulaybeeb]

• Implemented ForumModule encapsulating the new discussion logic.
• Created ForumThread, ForumComment, and ForumVote entities mapped with TypeORM.
• Built the ForumController to expose REST APIs for thread creation, hierarchical comments, and like/vote interactions.
• Integrated ForumService with AutoModerationService and ManualReviewService: newly created threads and comments are automatically analyzed via AI, and if flagged as toxic, are enqueued in the manual moderation queue.
• Updated AppModule to properly inject and initialize ForumModule.

Why it was done

To fulfill issue #571 and enable community engagement through robust discussion forums. The implementation addresses all acceptance criteria, including API endpoints, comment hierarchy, like/vote systems, and seamless moderation queue integration ensuring safety and community guidelines.

How it was verified

• TypeORM entities successfully initialize and map to the database tables without collision.
• The controller correctly injects the ForumService and passes along the contextual User ID.
• Content analysis automatically routes potentially toxic entries to the pre-existing moderation queue endpoints using proper metadata identifiers.
  Closes Implement discussion forum with moderation #571

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