refactor: reduce extension channel setup duplication

extensions/shared/passive-monitor.ts

@@ -0,0 +1,18 @@
+import { runPassiveAccountLifecycle } from "openclaw/plugin-sdk";
+
+type StoppableMonitor = {
+  stop: () => void;
+};
+
+export async function runStoppablePassiveMonitor<TMonitor extends StoppableMonitor>(params: {
+  abortSignal: AbortSignal;
+  start: () => Promise<TMonitor>;
+}): Promise<void> {
+  await runPassiveAccountLifecycle({
+    abortSignal: params.abortSignal,
+    start: params.start,
+    stop: async (monitor) => {
+      monitor.stop();
+    },
+  });
+}