feat: inject ContentsRepository into CommentsService for better integration

- Added `ContentsRepository` as a dependency to `CommentsService` and updated tests for mock setup.
- Adjusted import order in relevant files to align with project standards.

backend/src/comments/comments.service.ts

@@ -1,9 +1,9 @@
 import {
 	ForbiddenException,
+	forwardRef,
 	Inject,
 	Injectable,
 	NotFoundException,
-	forwardRef,
 } from "@nestjs/common";
 import { ContentsRepository } from "../contents/repositories/contents.repository";
 import { EventsGateway } from "../realtime/events.gateway";
@@ -54,9 +54,7 @@ export class CommentsService {
 
 			// 2. Si c'est une réponse, notifier l'auteur du commentaire parent
 			if (dto.parentId) {
-				const parentComment = await this.commentsRepository.findOne(
-					dto.parentId,
-				);
+				const parentComment = await this.commentsRepository.findOne(dto.parentId);
 				if (
 					parentComment &&
 					parentComment.userId !== userId &&