Revert "refactor: remove authentication middleware - unneeded and caused eslint to complain"

This reverts commit ab0a6cc151.

src/middleware/authentication.ts

@@ -0,0 +1,11 @@
+import { getNEXDataByPID } from '@/util';
+import type express from 'express';
+
+export default async function authenticationMiddleware(request: express.Request, response: express.Response, next: express.NextFunction): Promise<void> {
+	if (request.pid) {
+		// TODO - Get users PNIDs
+		request.nexAccount = await getNEXDataByPID(request.pid);
+	}
+
+	return next();
+}