feat: add loggers to all services

src/junior/services/qrcode.service.ts

@@ -1,9 +1,11 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable, Logger } from '@nestjs/common';
 import * as qrcode from 'qrcode';
 
 @Injectable()
 export class QrcodeService {
+  private readonly logger = new Logger(QrcodeService.name);
   generateQrCode(token: string): Promise<string> {
+    this.logger.log(`Generating QR code for token ${token}`);
     return qrcode.toDataURL(token);
   }
 }