Add basic messaging system

[markoub]

Description

Implement in-app messaging between Load Owners and assigned Drivers for coordination and communication.

Tasks

• Create messaging API endpoints
• Build messaging interface UI
• Implement real-time message delivery
• Create message history display
• Add message notifications
• Implement phone number reveal after booking acceptance
• Add message timestamp and read status
• Create mobile-friendly messaging interface

Acceptance Criteria

• Load owners and drivers can send messages to each other
• Messages are delivered in real-time
• Message history is preserved and accessible
• Phone numbers are revealed after load acceptance
• Notifications work for new messages
• Interface is user-friendly and responsive

Priority

Phase 3 - Communication enhancement