fix(qdreader): harden midnight cron dispatch

tests/qdreader_plugin.test.mjs

@@ -265,6 +265,29 @@ test('midnight cron archives previous run log and clears daily logs without runn
   assert.deepEqual(JSON.parse(r.store.qdreader_last_result_json), {});
 });
 
+
+test('delayed midnight cron still archives instead of signing', () => {
+  const previousRun = {
+    runId: '20260518_cron',
+    source: 'cron',
+    finishedAt: '2026-05-18T07:15:02.000Z',
+    total: 1,
+    okCount: 1,
+    failCount: 0,
+    items: [{ uid: '12345', ok: true, msg: '昨日签到成功' }],
+  };
+  const store = {
+    qdreader_cookie_json: JSON.stringify({ '12345': cookie }),
+    qdreader_user_bind_json: JSON.stringify({ '12345': 'user-a' }),
+    qdreader_last_run_json: JSON.stringify(previousRun),
+    qdreader_last_result_json: JSON.stringify({ '12345': JSON.stringify({ ok: true, msg: '昨日签到成功' }) }),
+  };
+  const r = runPlugin({ content: '', store, userId: 'cron', globals: { Date: fixedDateClass('2026-05-19T00:23:00.000+08:00') } });
+  assert.equal(r.calls.length, 0);
+  assert.match(r.replies[0], /日志归档完成/);
+  assert.equal(JSON.parse(r.store.qdreader_archive_json)['2026-05-18'].runId, '20260518_cron');
+});
+
 test('query falls back to archived sign results after daily log was cleared', () => {
   const archiveRun = {
     source: 'cron',