feat: harden ai onboarding and approval chat flows

tests/group-message-dispatch-plan.test.ts

@@ -270,6 +270,14 @@ test("POST /api/v1/projects/[projectId]/messages marks approval_required groups
   const persistedGroup = nextState.projects.find((project) => project.id === groupProject.id);
   assert.ok(persistedGroup, "expected group project to persist");
   assert.equal(persistedGroup?.approvalState, "pending_user");
+  const pendingNotice = persistedGroup?.messages.find(
+    (message) =>
+      message.sender === "master" &&
+      message.kind === "system_notice" &&
+      message.body.includes("等待你确认"),
+  );
+  assert.ok(pendingNotice, "expected an approval notice to be persisted in the group ledger");
+  assert.match(pendingNotice?.body ?? "", /等待你确认|待审批|待确认/);
 });
 
 test("POST /api/v1/projects/[projectId]/messages keeps message success when group dispatch recommendation fails", async () => {