Add blockchain event bridge service with smart contract event integration

- Phase 1: Core bridge service with gossip broker subscription
- Phase 2: Smart contract event integration via eth_getLogs RPC endpoint
- Add contract event subscriber for AgentStaking, PerformanceVerifier, Marketplace, Bounty, CrossChainBridge
- Add contract event handlers in agent_daemon.py and marketplace.py
- Add systemd service file for blockchain-event-bridge
- Update blockchain node router.py with eth_getLogs endpoint
- Add configuration for contract addresses
- Add tests for contract subscriber and handlers (27 tests passing)

apps/blockchain-event-bridge/tests/test_contract_handlers.py

@@ -0,0 +1,77 @@
+"""Tests for contract event handlers."""
+
+import pytest
+from unittest.mock import Mock, AsyncMock
+
+from blockchain_event_bridge.action_handlers.agent_daemon import AgentDaemonHandler
+from blockchain_event_bridge.action_handlers.marketplace import MarketplaceHandler
+
+
+@pytest.mark.asyncio
+async def test_agent_daemon_handle_staking_event():
+    """Test agent daemon handler for staking events."""
+    handler = AgentDaemonHandler("http://localhost:8006")
+
+    event_log = {
+        "topics": ["StakeCreated"],
+        "data": '{"stakeId": "123", "staker": "0xabc"}'
+    }
+
+    # Should not raise an error
+    await handler.handle_staking_event(event_log)
+
+
+@pytest.mark.asyncio
+async def test_agent_daemon_handle_performance_event():
+    """Test agent daemon handler for performance events."""
+    handler = AgentDaemonHandler("http://localhost:8006")
+
+    event_log = {
+        "topics": ["PerformanceVerified"],
+        "data": '{"verificationId": "456", "withinSLA": true}'
+    }
+
+    # Should not raise an error
+    await handler.handle_performance_event(event_log)
+
+
+@pytest.mark.asyncio
+async def test_agent_daemon_handle_bounty_event():
+    """Test agent daemon handler for bounty events."""
+    handler = AgentDaemonHandler("http://localhost:8006")
+
+    event_log = {
+        "topics": ["BountyCreated"],
+        "data": '{"bountyId": "789", "creator": "0xdef"}'
+    }
+
+    # Should not raise an error
+    await handler.handle_bounty_event(event_log)
+
+
+@pytest.mark.asyncio
+async def test_agent_daemon_handle_bridge_event():
+    """Test agent daemon handler for bridge events."""
+    handler = AgentDaemonHandler("http://localhost:8006")
+
+    event_log = {
+        "topics": ["BridgeInitiated"],
+        "data": '{"requestId": "101", "sourceChain": "ethereum"}'
+    }
+
+    # Should not raise an error
+    await handler.handle_bridge_event(event_log)
+
+
+@pytest.mark.asyncio
+async def test_marketplace_handle_contract_event():
+    """Test marketplace handler for contract events."""
+    handler = MarketplaceHandler("http://localhost:8011")
+
+    event_log = {
+        "topics": ["ServiceListed"],
+        "data": '{"serviceId": "202", "provider": "0x123"}'
+    }
+
+    # Should not raise an error
+    await handler.handle_contract_event(event_log)