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/coordinator-api/src/app/routers/explorer.py

@@ -63,3 +63,13 @@ async def list_receipts(
     offset: int = Query(default=0, ge=0),
 ) -> ReceiptListResponse:
     return _service(session).list_receipts(job_id=job_id, limit=limit, offset=offset)
+
+
+@router.get("/transactions/{tx_hash}", summary="Get transaction details by hash")
+async def get_transaction(
+    *,
+    session: Annotated[Session, Depends(get_session)],
+    tx_hash: str,
+) -> dict:
+    """Get transaction details by hash from blockchain RPC"""
+    return _service(session).get_transaction(tx_hash)