Implement Multi-Signature Property Governance System

[LaGodxy]

Description: Create a sophisticated multi-signature governance system for property management decisions, enabling decentralized decision-making for property modifications, sales, and major changes.

Acceptance Criteria:

• Design threshold-based multi-signature validation system
• Implement role-based permissions for different governance actions
• Add proposal creation, voting, and execution mechanisms
• Create governance token integration for voting power
• Implement timelock and emergency override mechanisms
• Add governance audit trail and transparency features
• Include governance analytics and participation metrics
• Provide governance dashboard and management interface

Files to modify:

• Create new contracts/governance/ module
• contracts/property-token/src/lib.rs - Integrate governance controls
• Add governance-specific tests and documentation