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/reports/reports.service.ts

@@ -1,4 +1,4 @@
-import { Injectable } from "@nestjs/common";
+import { Injectable, Logger } from "@nestjs/common";
 import { desc, eq } from "drizzle-orm";
 import { DatabaseService } from "../database/database.service";
 import { reports } from "../database/schemas";
@@ -6,9 +6,12 @@ import { CreateReportDto } from "./dto/create-report.dto";
 
 @Injectable()
 export class ReportsService {
+	private readonly logger = new Logger(ReportsService.name);
+
 	constructor(private readonly databaseService: DatabaseService) {}
 
 	async create(reporterId: string, data: CreateReportDto) {
+		this.logger.log(`Creating report from user ${reporterId}`);
 		const [newReport] = await this.databaseService.db
 			.insert(reports)
 			.values({
@@ -35,6 +38,7 @@ export class ReportsService {
 		id: string,
 		status: "pending" | "reviewed" | "resolved" | "dismissed",
 	) {
+		this.logger.log(`Updating report ${id} status to ${status}`);
 		return await this.databaseService.db
 			.update(reports)
 			.set({ status, updatedAt: new Date() })