Feature/pause resume functionality

[zachyo]

Contract Pause/Resume Functionality

Closes #6

Summary

Implements emergency pause/resume functionality for PropertyRegistry with role-based permissions, multi-sig resume, and auto-resume scheduling.

Key Features

• Emergency pause - Authorized pausers halt critical operations (register_property, transfer_property, create_escrow, release_escrow)
• Multi-sig resume - Configurable approval threshold with admin override
• Auto-resume - Schedule automatic contract resumption
• Audit trail - Complete event history with 11 event types

Implementation

• 18 new public functions
• 23 comprehensive tests (all passing ✅)
• Complete documentation in docs/pause-resume-functionality.md

Usage

contract.pause()?;
contract.schedule_auto_resume(timestamp)?;
contract.approve_resume()?;
contract.resume()?;

[LaGodxy]

@zachyo resolve conflicts.

[LaGodxy]

@zachyo please, resolve conflict.