feat: add logging and caching enhancements across core services

Integrate `Logger` for consistent logging in services like `reports`, `categories`, `users`, `contents`, and more. Introduce caching capabilities with `CacheInterceptor` and manual cache clearing logic for categories, users, and contents. Add request throttling to critical auth endpoints for enhanced rate limiting.

backend/src/favorites/favorites.service.ts

@@ -1,6 +1,7 @@
 import {
 	ConflictException,
 	Injectable,
+	Logger,
 	NotFoundException,
 } from "@nestjs/common";
 import { and, eq } from "drizzle-orm";
@@ -9,9 +10,12 @@ import { contents, favorites } from "../database/schemas";
 
 @Injectable()
 export class FavoritesService {
+	private readonly logger = new Logger(FavoritesService.name);
+
 	constructor(private readonly databaseService: DatabaseService) {}
 
 	async addFavorite(userId: string, contentId: string) {
+		this.logger.log(`Adding favorite: user ${userId}, content ${contentId}`);
 		// Vérifier si le contenu existe
 		const content = await this.databaseService.db
 			.select()
@@ -35,6 +39,7 @@ export class FavoritesService {
 	}
 
 	async removeFavorite(userId: string, contentId: string) {
+		this.logger.log(`Removing favorite: user ${userId}, content ${contentId}`);
 		const result = await this.databaseService.db
 			.delete(favorites)
 			.where(and(eq(favorites.userId, userId), eq(favorites.contentId, contentId)))