Add Emergency Pause and Recovery Mechanism

[DevMuhdishaq]

Description

Implement emergency pause functionality to halt contract operations during security incidents, with recovery procedures to resume normal operations safely.

Acceptance Criteria

• Admin-controlled pause function
• Pause state tracking and visibility
• All payment functions respect pause state
• Graceful error messages when paused
• Recovery function with time-lock mechanism
• Event logging for pause/resume events
• Automated tests for pause/resume scenarios
• Documentation of emergency procedures

Tasks

1. Add pause state variable
2. Implement pause/unpause functions
3. Add time-lock mechanism
4. Create event logging
5. Update all payment functions
6. Write emergency scenario tests