Feature: Add get_audit_log MCP tool

Expose the server main-window audit log (host online/offline, operation
results, alerts) as a read-only, no-arg, in-memory MCP tool. The log lives
in m_CList_Message, a CListCtrl that is only safe to touch on the UI
thread, so add a thread-safe mirror m_MessageLog (guarded by m_cs) and keep
it in sync at the four item-mutation sites: ShowMessage, OnShowErrMessage,
OnMsglogDelete and OnMsglogClear. The tool reads the mirror directly under
m_cs and returns up to MAX_MESSAGE_COUNT (1000) entries, newest first.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015RemoteDlg.h

@@ -340,6 +340,15 @@ public:
     std::vector<int> m_PendingOffline;  // 存储端口号
     CListCtrlEx m_CList_Online;
     CListCtrl   m_CList_Message;
+    // 消息/审计日志的线程安全镜像（供 MCP get_audit_log 工具读取）。m_CList_Message 是
+    // CListCtrl、只能在 UI 线程访问，MCP 线程据此镜像读取。受 m_cs 保护，新在前、旧在后，
+    // 与 CListCtrl 显示顺序一致（索引一一对应，便于删除同步）。
+    struct LogMessage {
+        std::string type;   // 类型（操作成功/主机上线/主机下线…）
+        std::string time;   // 时间戳 "YYYY-MM-DD HH:MM:SS"
+        std::string msg;    // 内容
+    };
+    std::vector<LogMessage> m_MessageLog;
     CSplitterBar m_SplitterBar;
     int m_nSplitPos = 160;  // 消息区高度（像素），可拖动调整
     std::vector<context*> m_HostList;              // 虚拟列表数据源（全部客户端）