modify: 网关拆为独立包 chongming-gateway（源码迁出到 utils/gateway，打包只留 plugins.mbank）

test/test_instance_targeting.py

@@ -18,9 +18,9 @@ import asyncio
 import sys
 from pathlib import Path
 
-_HERE = Path(__file__).resolve().parent          # chongming-zenoh/
+_HERE = Path(__file__).resolve().parent.parent   # chongming-zenoh/
 _PROJ = _HERE
-for _p in (_PROJ / "src", _PROJ / "utils" / "worker" / "src"):
+for _p in (_PROJ / "gateway" / "src", _PROJ / "utils" / "worker" / "src"):
     sys.path.insert(0, str(_p))
 
 from chongming.app.core.worker_manager import WorkerManager  # noqa: E402