完善外部生成Worker动态扩缩容

新增外部生成controller进程角色与systemd服务

补齐队列统计procedure与spacetime-client绑定

更新生产部署脚本、健康巡检和server provision的worker/controller口径

新增容器worker smoke脚本并同步运维文档与团队记忆

deploy/systemd/genarrative-external-generation-controller.service

@@ -0,0 +1,27 @@
+[Unit]
+Description=Genarrative External Generation Worker Controller
+After=network-online.target spacetimedb.service
+Wants=network-online.target
+Requires=spacetimedb.service
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/genarrative/current
+EnvironmentFile=/etc/genarrative/api-server.env
+EnvironmentFile=-/etc/genarrative/external-generation-controller.env
+ExecStart=/usr/bin/env GENARRATIVE_PROCESS_ROLE=external-generation-controller GENARRATIVE_TRACKING_OUTBOX_DIR=/var/lib/genarrative/tracking-outbox/controller OTEL_SERVICE_NAME=genarrative-external-generation-controller /opt/genarrative/current/api-server
+Restart=always
+RestartSec=5
+KillSignal=SIGINT
+TimeoutStopSec=120
+LimitNOFILE=65535
+TasksMax=512
+
+# controller 需要调用 systemctl 管理 worker@N 实例，因此不降为 genarrative 用户。
+# 它只复用 api-server 发布包和 SpacetimeDB 配置，不直接执行外部生成任务。
+PrivateTmp=true
+ProtectSystem=full
+ReadWritePaths=/opt/genarrative /var/lib/genarrative
+
+[Install]
+WantedBy=multi-user.target