refactor(ports): standardize service ports to 8000-8017 range and update CORS configurations across all services

- Update CORS allow_origins in blockchain-node app.py and gossip relay.py to use new port logic (8000-8016)
- Update coordinator-api config.py and config_pg.py with standardized port ranges and service labels
- Update coordinator-api health check script from port 18000 to 8000
- Update geo_load_balancer.py to use configurable host/port (default 0.0.0.0:8017)
- Update agent_security.py sandbox

apps/trade-exchange/simple_exchange_api.py

@@ -580,7 +580,7 @@ class WalletAPIHandler(BaseHTTPRequestHandler):
         self.send_header('Access-Control-Allow-Headers', 'Content-Type')
         self.end_headers()
 
-def run_server(port=3003):
+def run_server(port=8001):
     """Run the server"""
     init_db()
     # Removed mock trades - now using only real blockchain data