补上43101保留原始错误信息的区分性断言，修复wx测试的恢复时机

- reminder.test.js：43101用例新增对 remind_logs.error 的断言，区分
  「真发送失败」（应为微信原始错误信息）与「因halted被跳过」（应为
  quota_exhausted兜底文案），此前该区别完全没有测试覆盖
- wx.test.js：把恢复 axios.get/post 的语句移入 try/finally，避免断言
  先抛错时污染同进程内后续用例

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

server/test/wx.test.js

@@ -13,23 +13,26 @@ test('微信返回非 0 errcode 时，抛出的 Error 对象应带上原始 errc
   const restoreGet = axios.get
   const restorePost = axios.post
 
-  // getAccessToken 走 axios.get，sendSubscribeMessage 走 axios.post，两个都要 mock
-  axios.get = async () => ({ data: { access_token: 'fake_token', expires_in: 7200 } })
-  axios.post = async () => ({ data: { errcode: 43101, errmsg: 'user refuse to accept the msg' } })
+  try {
+    // getAccessToken 走 axios.get，sendSubscribeMessage 走 axios.post，两个都要 mock
+    axios.get = async () => ({ data: { access_token: 'fake_token', expires_in: 7200 } })
+    axios.post = async () => ({ data: { errcode: 43101, errmsg: 'user refuse to accept the msg' } })
 
-  await assert.rejects(
-    () => wx.sendSubscribeMessage({
-      touser: 'oTest',
-      page: 'pages/index/index',
-      templateId: 'tplTest',
-      data: {}
-    }),
-    (err) => {
-      assert.strictEqual(err.errcode, 43101, 'Error 对象应带上微信返回的原始 errcode，而不是靠字符串匹配')
-      return true
-    }
-  )
-
-  axios.get = restoreGet
-  axios.post = restorePost
+    await assert.rejects(
+      () => wx.sendSubscribeMessage({
+        touser: 'oTest',
+        page: 'pages/index/index',
+        templateId: 'tplTest',
+        data: {}
+      }),
+      (err) => {
+        assert.strictEqual(err.errcode, 43101, 'Error 对象应带上微信返回的原始 errcode，而不是靠字符串匹配')
+        return true
+      }
+    )
+  } finally {
+    // 断言先抛错也要恢复，避免污染同进程内后续用例
+    axios.get = restoreGet
+    axios.post = restorePost
+  }
 })