Add Emergency Pause and Security Features

[bakarezainab]

Tasks Done

• Contract can be emergency paused
• All critical functions blocked when paused
• Multi-sig unpause implemented
• Emergency withdrawals work correctly
• Security events properly logged
• Timelock prevents instant critical changes
• All security scenarios tested

closes #143

[RUKAYAT-CODER]

Please resolve conflict

[RUKAYAT-CODER]

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[RUKAYAT-CODER]

Please resolve conflict