ser：服务端接收大量无效数据时踢出客户端。

Protocol/Protocol.h

@@ -13,6 +13,8 @@ constexpr quint32 CHUNK_BUF_SIZE = 1 * 1024 * 512;
 constexpr quint32 FLOW_BACK_MULTIPLE = 50;
 // 阻塞等级放大倍率
 constexpr quint32 BLOCK_LEVEL_MULTIPLE = 5;
+// 允许最大的无效数据包大小
+constexpr quint32 MAX_INVALID_PACKET_SIZE = CHUNK_BUF_SIZE * 5;
 
 // It is specified here that the first 30 contents (inclusive) are
 // used for communication with the server.