Feature: Add MCP (Model Context Protocol) server integration

Add an optional MCP server (JSON-RPC 2.0 over Streamable HTTP) exposing
an online-host listing tool, protected by a Bearer token. Disabled by
default; configured via a new "Extensions > MCP Settings" dialog.

- McpServer: httplib + JSON-RPC 2.0 dispatch (initialize/ping/tools/list/tools/call)
- McpSettingsDlg: runtime-created dialog for enable/port/bind/token
- HostJson: extract single-host JSON serialization shared with WebService
- FRP: expose MCP port (union with listening/Web ports) when bound to 0.0.0.0
- i18n: en_US / zh_TW translations

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015Remote_vs2015.vcxproj

@@ -317,6 +317,7 @@
     <ClInclude Include="file\CFileTransferModeDlg.h" />
     <ClInclude Include="HideScreenSpyDlg.h" />
     <ClInclude Include="HostInfo.h" />
+    <ClInclude Include="HostJson.h" />
     <ClInclude Include="InputDlg.h" />
     <ClInclude Include="ZstaPickerDlg.h" />
     <ClInclude Include="IOCPKCPServer.h" />
@@ -325,6 +326,8 @@
     <ClInclude Include="IPHistoryDlg.h" />
     <ClInclude Include="KeyBoardDlg.h" />
     <ClInclude Include="LangManager.h" />
+    <ClInclude Include="McpServer.h" />
+    <ClInclude Include="McpSettingsDlg.h" />
     <ClInclude Include="NetworkDlg.h" />
     <ClInclude Include="NotifyConfig.h" />
     <ClInclude Include="NotifyManager.h" />
@@ -387,6 +390,9 @@
     <ClCompile Include="PreviewTipWnd.cpp" />
     <ClCompile Include="TriggerSettingsDlg.cpp" />
     <ClCompile Include="WebService.cpp" />
+    <ClCompile Include="HostJson.cpp" />
+    <ClCompile Include="McpServer.cpp" />
+    <ClCompile Include="McpSettingsDlg.cpp" />
     <ClCompile Include="..\..\client\MemoryModule.c">
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|x64'">NotUsing</PrecompiledHeader>
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">NotUsing</PrecompiledHeader>