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/coordinator-api/scripts/check_coordinator_proxy.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-HEALTH_URL="http://127.0.0.1:18000/v1/health"
+HEALTH_URL="http://127.0.0.1:8000/v1/health"
 MAX_RETRIES=10
 RETRY_DELAY=2
 

apps/coordinator-api/scripts/geo_load_balancer.py

@@ -148,4 +148,6 @@ async def create_app():
 
 if __name__ == '__main__':
     app = asyncio.run(create_app())
-    web.run_app(app, host='127.0.0.1', port=8080)
+    host = os.environ.get('HOST', '0.0.0.0')
+    port = int(os.environ.get('PORT', 8017))
+    web.run_app(app, host=host, port=port)