fix: also clear API_SERVER_KEY for profile gateways

Line 1521 in gateway/config.py: if api_server_enabled or api_server_key:
The compose.yml sets API_SERVER_KEY=hermes_local_key, which was enough
to enable the API server even with API_SERVER_ENABLED=false.

run-multi-gateways.sh

@@ -25,7 +25,7 @@ for profile in "${PROFILES[@]}"; do
   [ -z "${profile}" ] && continue
 
   echo "Starting gateway for profile: ${profile}"
-  nohup env API_SERVER_ENABLED=false gosu hermes "$HERMES_BIN" --profile "${profile}" gateway run \
+  nohup env API_SERVER_ENABLED=false API_SERVER_KEY= gosu hermes "$HERMES_BIN" --profile "${profile}" gateway run \
       >> "/opt/data/logs/gateway-${profile}.log" 2>&1 &
 done