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/src/blockchain_event_bridge/main.py

@@ -0,0 +1,74 @@
+"""Main FastAPI application for blockchain event bridge."""
+
+import asyncio
+import logging
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from prometheus_client import make_asgi_app
+
+from .config import settings
+from .bridge import BlockchainEventBridge
+from .metrics import (
+    events_received_total,
+    events_processed_total,
+    actions_triggered_total,
+    actions_failed_total,
+)
+
+logger = logging.getLogger(__name__)
+
+bridge_instance: BlockchainEventBridge | None = None
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Lifespan context manager for startup/shutdown."""
+    global bridge_instance
+
+    logger.info(f"Starting {settings.app_name}...")
+
+    # Initialize and start the bridge
+    bridge_instance = BlockchainEventBridge(settings)
+    await bridge_instance.start()
+
+    logger.info(f"{settings.app_name} started successfully")
+
+    yield
+
+    # Shutdown
+    logger.info(f"Shutting down {settings.app_name}...")
+    if bridge_instance:
+        await bridge_instance.stop()
+    logger.info(f"{settings.app_name} shut down successfully")
+
+
+app = FastAPI(
+    title=settings.app_name,
+    description="Bridge between AITBC blockchain events and OpenClaw agent triggers",
+    version="0.1.0",
+    lifespan=lifespan,
+)
+
+# Add Prometheus metrics endpoint
+metrics_app = make_asgi_app()
+app.mount("/metrics", metrics_app)
+
+
+@app.get("/health")
+async def health_check():
+    """Health check endpoint."""
+    return {
+        "status": "healthy",
+        "bridge_running": bridge_instance is not None and bridge_instance.is_running,
+    }
+
+
+@app.get("/")
+async def root():
+    """Root endpoint."""
+    return {
+        "service": settings.app_name,
+        "version": "0.1.0",
+        "status": "running",
+    }