Add real-time chat between users using Socket.io

[AyshaVolidis]

Summary

Implemented a full-featured real-time chat system between users with Socket.io, including backend endpoints and frontend integration.

Frontend

• Real-time socket connection for sending and receiving messages.
• Chat UI supporting:
  • Sending new messages
  • Deleting messages
  • Deleting entire chat sessions
  • Displaying all users available for chat
• Smooth interaction between UI and backend endpoints.

Backend

• CRUD endpoints for chats and messages:
  • Add new messages
  • Delete individual messages
  • Delete entire chat threads
  • List all users
• Socket.io events integrated for real-time communication.
• Messages linked to users and chat sessions in the database.
• Proper handling of user connection and disconnection events.

relates with #17