fix: 共享 WeChatPusher 错误消息不泄露 webhook URL

lib/wechat/wechat-pusher.ts

@@ -38,7 +38,7 @@ export class WeChatPusher {
       const body = await res.text().catch(() => null)
       return { success: res.ok, responseCode: res.status, responseBody: body }
     } catch (err) {
-      return { success: false, responseCode: null, responseBody: null, error: String(err) }
+      return { success: false, responseCode: null, responseBody: null, error: 'Network request failed' }
     }
   }
 }