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/users/users.service.ts

@@ -1,4 +1,6 @@
-import { Injectable } from "@nestjs/common";
+import { Injectable, Logger, Inject } from "@nestjs/common";
+import { CACHE_MANAGER } from "@nestjs/cache-manager";
+import { Cache } from "cache-manager";
 import { eq, sql } from "drizzle-orm";
 import { CryptoService } from "../crypto/crypto.service";
 import { DatabaseService } from "../database/database.service";
@@ -11,11 +13,20 @@ import { UpdateUserDto } from "./dto/update-user.dto";
 
 @Injectable()
 export class UsersService {
+	private readonly logger = new Logger(UsersService.name);
+
 	constructor(
 		private readonly databaseService: DatabaseService,
 		private readonly cryptoService: CryptoService,
+		@Inject(CACHE_MANAGER) private cacheManager: Cache,
 	) {}
 
+	private async clearUserCache(username?: string) {
+		if (username) {
+			await this.cacheManager.del(`users/profile/${username}`);
+		}
+	}
+
 	async create(data: {
 		username: string;
 		email: string;
@@ -119,11 +130,17 @@ export class UsersService {
 	}
 
 	async update(uuid: string, data: UpdateUserDto) {
-		return await this.databaseService.db
+		this.logger.log(`Updating user profile for ${uuid}`);
+		const result = await this.databaseService.db
 			.update(users)
 			.set({ ...data, updatedAt: new Date() })
 			.where(eq(users.uuid, uuid))
 			.returning();
+
+		if (result[0]) {
+			await this.clearUserCache(result[0].username);
+		}
+		return result;
 	}
 
 	async updateConsent(