feat(messaging): Implement WebSocket or Server-Sent Events (SSE) for real-time communication

[LinnJS]

Description

Set up a real-time communication layer using WebSocket or SSE for mentor-mentee messaging.

Epic: https://github.com/orgs/TampaDevs/projects/7/views/1?pane=issue&itemId=90108532&issue=TampaDevs%7Cmentorship.tampa.dev%7C16

User Story

• As a mentee, I want to receive messages instantly so that I can collaborate seamlessly with my mentor.
• As a mentor, I want reliable real-time communication so that I can respond to mentees without delays.

Acceptance Criteria

• Real-time communication is implemented using WebSocket or SSE.
• The system is scalable and supports multiple active connections.