feat: implement complete OpenClaw DAO governance system

🏛️ OpenClawDAO Smart Contract Implementation:

Core Governance Contract:
- Enhanced OpenClawDAO with snapshot security and anti-flash-loan protection
- Token-weighted voting with 24-hour TWAS calculation
- Multi-sig protection for critical proposals (emergency/protocol upgrades)
- Agent swarm role integration (Provider/Consumer/Builder/Coordinator)
- Proposal types: Parameter Change, Protocol Upgrade, Treasury, Emergency, Agent Trading, DAO Grants
- Maximum voting power limits (5% per address) and vesting periods

Security Features:
- Snapshot-based voting power capture prevents flash-loan manipulation
- Proposal bonds and challenge mechanisms for proposal validation
- Multi-signature requirements for critical governance actions
- Reputation-based voting weight enhancement for agents
- Emergency pause and recovery mechanisms

Agent Wallet Contract:
- Autonomous agent voting with configurable strategies
- Role-specific voting preferences based on agent type
- Reputation-based voting power bonuses
- Authorized caller management for agent control
- Emergency stop and reactivate functionality
- Autonomous vote execution based on predefined strategies

GPU Staking Contract:
- GPU resource staking with AITBC token collateral
- Reputation-based reward rate calculations
- Utilization-based reward scaling
- Lock period enforcement with flexible durations
- Provider reputation tracking and updates
- Multi-pool support with different reward rates

Deployment & Testing:
- Complete deployment script with system configuration
- Comprehensive test suite covering all major functionality
- Multi-sig setup and initial agent registration
- Snapshot creation and staking pool initialization
- Test report generation with detailed results

🔐 Security Implementation:
- Anti-flash-loan protection through snapshot voting
- Multi-layer security (proposal bonds, challenges, multi-sig)
- Reputation-based access control and voting enhancement
- Emergency mechanisms for system recovery
- Comprehensive input validation and access controls

📊 Governance Features:
- 6 proposal types covering all governance scenarios
- 4 agent swarm roles with specialized voting preferences
- Token-weighted voting with reputation bonuses
- 7-day voting period with 1-day delay
- 4% quorum requirement and 1000 AITBC proposal threshold

🚀 Ready for deployment and integration with AITBC ecosystem

apps/blockchain-explorer/assets/index.js

@@ -64,7 +64,32 @@ const app = createApp({
     
     formatTime(timestamp) {
       if (!timestamp) return '-'
-      return new Date(timestamp * 1000).toLocaleString()
+      
+      // Handle ISO strings
+      if (typeof timestamp === 'string') {
+        try {
+          const date = new Date(timestamp)
+          return date.toLocaleString()
+        } catch (e) {
+          console.warn('Invalid timestamp format:', timestamp)
+          return '-'
+        }
+      }
+      
+      // Handle numeric timestamps (could be seconds or milliseconds)
+      const numTimestamp = Number(timestamp)
+      if (isNaN(numTimestamp)) return '-'
+      
+      // If timestamp is in seconds (typical Unix timestamp), convert to milliseconds
+      // If timestamp is already in milliseconds, use as-is
+      const msTimestamp = numTimestamp < 10000000000 ? numTimestamp * 1000 : numTimestamp
+      
+      try {
+        return new Date(msTimestamp).toLocaleString()
+      } catch (e) {
+        console.warn('Invalid timestamp value:', timestamp)
+        return '-'
+      }
     },
     
     formatNumber(num) {