1、尝试修复rpc报错问题

lib/rpc.dart

@@ -49,7 +49,7 @@ class JsonRpcProxy {
   /// 平台服务
   PlatformService get platform {
     if (_platformService == null)
-      _platformService = PlatformService("http://$platformHost");
+      _platformService = PlatformService("http://$platformHost", timeout: 15000);
     return _platformService!;
   }