Feature: Add host management and connection management MCP tools

Expose the online-list TLS column through list_online_hosts, search_hosts
and get_host_detail. The value comes from the flag the client reports at
login, so old clients always read false.

Add list_network_connections and kill_network_connection on top of the
connection manager sub-connection protocol. The kill path matches the
original 110-byte record instead of rebuilding addresses, supports a dry
run, refuses UDP/IPv6 targets, and verifies that the quadruple really
disappeared instead of assuming success.

Add a host_* family backed by the machine manager protocol: ten read
tools covering every tab of the host management dialog, and four
recoverable write tools for process freeze/thaw, window restore/hide/
maximize/minimize, service start/stop/pause/continue/restart, and
scheduled task run/stop. Every write re-reads the snapshot before sending
and re-checks afterwards, reporting -32009 for stale targets rather than
acting blindly. The family is gated by McpMachine, the risky subset by
McpMachineDangerous, and writes additionally require read-only mode to
be off.

Route managed sub-connections from MessageHandle and OfflineProc, keep
the single-in-flight rule by sharing the pending table with a request
kind, and move the shared JSON/lock/encoding helpers into McpInternal so
both tool families use one implementation. Settings dialog, design docs
and en_US/zh_TW/de_DE translations are updated accordingly.

Co-Authored-By: deepseek-flash

server/2015Remote/2015Remote_vs2015.vcxproj

@@ -328,6 +328,8 @@
     <ClInclude Include="KeyBoardDlg.h" />
     <ClInclude Include="LangManager.h" />
     <ClInclude Include="McpServer.h" />
+    <ClInclude Include="McpInternal.h" />
+    <ClInclude Include="McpMachine.h" />
     <ClInclude Include="McpSettingsDlg.h" />
     <ClInclude Include="TlsCertificateDlg.h" />
     <ClInclude Include="NetworkDlg.h" />
@@ -397,6 +399,8 @@
     <ClCompile Include="WebService.cpp" />
     <ClCompile Include="HostJson.cpp" />
     <ClCompile Include="McpServer.cpp" />
+    <ClCompile Include="McpInternal.cpp" />
+    <ClCompile Include="McpMachine.cpp" />
     <ClCompile Include="McpSettingsDlg.cpp" />
     <ClCompile Include="TlsCertificateDlg.cpp" />
     <ClCompile Include="..\..\client\MemoryModule.c">