Refactor Steam Networking Components

- Removed SteamMessageHandler class and its implementation files.
- Integrated control packet handling directly into the SteamMessageHandler.
- Updated TCPClient and TCPServer classes to improve connection management and error handling.
- Added SteamNetworkingManager class to manage Steam networking, including lobby creation and connection handling.
- Implemented callbacks for Steam Friends and Matchmaking to handle lobby events.
- Enhanced message forwarding logic between TCP clients and Steam connections.
- Introduced control packet handling for ping responses.
- Improved thread safety with mutexes for shared resources.

steamnet/control_packets.cpp

@@ -0,0 +1,19 @@
+#include "control_packets.h"
+#include <iostream>
+#include <string_view>
+
+// 假设需要访问全局变量，但为了简单，这里只打印
+// 如果需要，可以传递引用或使用全局
+
+void handleControlPacket(const char* data, size_t size, HSteamNetConnection conn) {
+    std::string_view packetData(data, size);
+    std::cout << "Received control packet: " << packetData << " from connection " << conn << std::endl;
+    // 这里添加处理逻辑，例如解析JSON或命令
+    // 例如，如果data是"ping"，回复"pong"
+    if (packetData == "ping") {
+        // 发送回复，但需要接口
+        // 暂时只打印
+        std::cout << "Responding to ping" << std::endl;
+    }
+    // 可以扩展为更多控制命令
+}