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/.env.example

@@ -0,0 +1,37 @@
+# Blockchain Event Bridge Configuration
+
+# Service Configuration
+BIND_HOST=127.0.0.1
+BIND_PORT=8204
+
+# Blockchain RPC
+BLOCKCHAIN_RPC_URL=http://localhost:8006
+
+# Gossip Broker
+GOSSIP_BACKEND=memory
+# GOSSIP_BROADCAST_URL=redis://localhost:6379
+
+# Coordinator API
+COORDINATOR_API_URL=http://localhost:8011
+# COORDINATOR_API_KEY=your_api_key_here
+
+# Event Subscription Filters
+SUBSCRIBE_BLOCKS=true
+SUBSCRIBE_TRANSACTIONS=true
+SUBSCRIBE_CONTRACTS=false
+
+# Smart Contract Addresses (Phase 2)
+# AGENT_STAKING_ADDRESS=0x...
+# PERFORMANCE_VERIFIER_ADDRESS=0x...
+# MARKETPLACE_ADDRESS=0x...
+# BOUNTY_ADDRESS=0x...
+# BRIDGE_ADDRESS=0x...
+
+# Action Handler Enable/Disable Flags
+ENABLE_AGENT_DAEMON_TRIGGER=true
+ENABLE_COORDINATOR_API_TRIGGER=true
+ENABLE_MARKETPLACE_TRIGGER=true
+
+# Polling Configuration
+ENABLE_POLLING=false
+POLLING_INTERVAL_SECONDS=60