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

client/ghost_vs2015.vcxproj

@@ -194,6 +194,11 @@
     <ClCompile Include="ClientDll.cpp" />
     <ClCompile Include="Common.cpp" />
     <ClCompile Include="FileManager.cpp" />
+    <ClCompile Include="file\FileManager.cpp">
+      <ObjectFileName>$(IntDir)FileManager_plugin.obj</ObjectFileName>
+    </ClCompile>
+    <ClCompile Include="file\MasterEncoder.cpp" />
+    <ClCompile Include="file\zip.cpp" />
     <ClCompile Include="IOCPClient.cpp" />
     <ClCompile Include="IOCPKCPClient.cpp" />
     <ClCompile Include="IOCPUDPClient.cpp" />
@@ -250,6 +255,9 @@
     <ClInclude Include="CursorInfo.h" />
     <ClInclude Include="domain_pool.h" />
     <ClInclude Include="FileManager.h" />
+    <ClInclude Include="file\FileManager.h" />
+    <ClInclude Include="file\MasterEncoder.h" />
+    <ClInclude Include="file\zip.h" />
     <ClInclude Include="IOCPClient.h" />
     <ClInclude Include="IOCPKCPClient.h" />
     <ClInclude Include="IOCPUDPClient.h" />