fix: skip gateway shutdown during dev restarts (#661)

Set HERMES_WEB_UI_STOP_GATEWAYS_ON_SHUTDOWN=0 in nodemon.json so
nodemon restarts don't kill running gateways. Production behavior
unchanged (stops owned gateways by default).

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

nodemon.json

@@ -5,7 +5,8 @@
     "ts": "node -r ts-node/register"
   },
   "env": {
-    "TS_NODE_PROJECT": "packages/server/tsconfig.json"
+    "TS_NODE_PROJECT": "packages/server/tsconfig.json",
+    "HERMES_WEB_UI_STOP_GATEWAYS_ON_SHUTDOWN": "0"
   },
   "exec": "node -r ts-node/register packages/server/src/index.ts",
   "nodeArgs": ["--no-warnings"],

packages/server/src/services/shutdown.ts

@@ -3,8 +3,8 @@ import { closeDb } from '../db'
 import { getGatewayManagerInstance } from './gateway-bootstrap'
 
 function shouldStopGatewaysOnShutdown(signal: string): boolean {
-  // 总是停止网关，无论是开发环境还是生产环境
-  // 这样可以避免 nodemon 重启时的孤儿进程问题
+  // nodemon may use SIGTERM on Windows restarts, so dev mode opts out via env.
+  // Production keeps stopping owned gateways by default.
   const override = process.env.HERMES_WEB_UI_STOP_GATEWAYS_ON_SHUTDOWN?.trim()
   if (override === '0' || override === 'false') return false
   if (override === '1' || override === 'true') return true