treasury updated event

[koder-ns]

closes #553

📝 Description

This PR adds the TreasuryUpdated event emission when an admin changes the treasury wallet address. This event provides on-chain transparency for treasury management, enabling stakeholders to monitor when and by whom the critical treasury address is modified.

Problem Statement

The current set_treasury() function allows administrators to update the treasury wallet without emitting any on-chain event. This creates several issues:

• No historical record of treasury address changes
• Stakeholders cannot easily detect unauthorized treasury changes
• Auditors have no on-chain proof of treasury updates
• Off-chain monitoring systems cannot alert on treasury modifications
• No accountability for which admin performed the change

Solution

Emit a TreasuryUpdated event with old treasury, new treasury, and admin address whenever set_treasury() is successfully called. This event creates an immutable audit trail of all treasury changes on the blockchain.

Key Features

• Event Signature: TreasuryUpdated(old_treasury: Address, new_treasury: Address, updated_by: Address)
• Emission Timing: Emitted immediately after treasury address is updated
• Complete Audit Trail: Records both previous and new addresses for historical tracking
• Admin Accountability: Includes the address of the admin who made the change
• Gas Efficiency: Minimal gas overhead for critical security event

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