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/comments/comments.service.ts

@@ -0,0 +1,37 @@
+import {
+	ForbiddenException,
+	Injectable,
+	NotFoundException,
+} from "@nestjs/common";
+import { CommentsRepository } from "./repositories/comments.repository";
+import type { CreateCommentDto } from "./dto/create-comment.dto";
+
+@Injectable()
+export class CommentsService {
+	constructor(private readonly commentsRepository: CommentsRepository) {}
+
+	async create(userId: string, contentId: string, dto: CreateCommentDto) {
+		return this.commentsRepository.create({
+			userId,
+			contentId,
+			text: dto.text,
+		});
+	}
+
+	async findAllByContentId(contentId: string) {
+		return this.commentsRepository.findAllByContentId(contentId);
+	}
+
+	async remove(userId: string, commentId: string, isAdmin = false) {
+		const comment = await this.commentsRepository.findOne(commentId);
+		if (!comment) {
+			throw new NotFoundException("Comment not found");
+		}
+
+		if (!isAdmin && comment.userId !== userId) {
+			throw new ForbiddenException("You cannot delete this comment");
+		}
+
+		await this.commentsRepository.delete(commentId);
+	}
+}