Prepare a websocket server for real-time chat

[shun2218-dev]

Make only minimal preparations to check operation.

• BE
  • [ ] Laravel WebSockets Laravel Reverb
  • [ ] Laravel Echo
  • FE
  • [ ] laravel-echo
  • [ ] pusher-js

[shun2218-dev]

• Laravel WebSockets is moving into maintenance mode and development has stopped
• Laravel 11 does not seem to be supported (errors occur when dependencies cannot be resolved at the installation stage)
• Laravel Reverb is officially listed as an alternative library

For the above reasons, we will verify if Laravel WebSockets can be implemented with Laravel Reverb.