Feat: Extend token expiry duration

1h is too short for practical usage.
This change extends the expiry duration to 12h to cover a full working day.

Author: ntcho

backend/services/authService.js

@@ -109,7 +109,7 @@ module.exports = {
       group: loginUser.group,
       status: loginUser.status,
     }, JWT_SECRET_KEY, {
-      expiresIn: '1h',
+      expiresIn: '12h',
     });
 
     return user;