feat(logging): introduce HTTP logging middleware

Add middleware to log HTTP request and response details, including method, URL, status, duration, user agent, and hashed IP address. Logs categorized by severity based on response status code.

backend/src/common/middlewares/http-logger.middleware.ts

@@ -0,0 +1,35 @@
+import { Injectable, Logger, NestMiddleware } from "@nestjs/common";
+import { NextFunction, Request, Response } from "express";
+import { createHash } from "node:crypto";
+
+@Injectable()
+export class HTTPLoggerMiddleware implements NestMiddleware {
+	private readonly logger = new Logger("HTTP");
+
+	use(request: Request, response: Response, next: NextFunction): void {
+		const { method, originalUrl, ip } = request;
+		const userAgent = request.get("user-agent") || "";
+		const startTime = Date.now();
+
+		response.on("finish", () => {
+			const { statusCode } = response;
+			const contentLength = response.get("content-length");
+			const duration = Date.now() - startTime;
+
+			const hashedIp = createHash("sha256").update(ip).digest("hex");
+			const message = `${method} ${originalUrl} ${statusCode} ${contentLength || 0} - ${userAgent} ${hashedIp} +${duration}ms`;
+
+			if (statusCode >= 500) {
+				return this.logger.error(message);
+			}
+
+			if (statusCode >= 400) {
+				return this.logger.warn(message);
+			}
+
+			return this.logger.log(message);
+		});
+
+		next();
+	}
+}