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"],