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/resource.h

@@ -1012,6 +1012,7 @@
 #define ID_CONNECTION_KILL              33087
 #define ID_CONNECTION_REFRESH           33088
 #define ID_TALK_MANAGE                 33089
+#define ID_EXPERIMENT_FILE_MANAGER      33090
 #define ID_33046                        33046
 #define ID_PROXY_PORT_AUTORUN           33047
 #define ID_TRIGGER_SETTINGS             33048
@@ -1076,7 +1077,7 @@
 #ifdef APSTUDIO_INVOKED
 #ifndef APSTUDIO_READONLY_SYMBOLS
 #define _APS_NEXT_RESOURCE_VALUE        407
-#define _APS_NEXT_COMMAND_VALUE         33090
+#define _APS_NEXT_COMMAND_VALUE         33091
 #define _APS_NEXT_CONTROL_VALUE         2593
 #define _APS_NEXT_SYMED_VALUE           105
 #endif