Feature: add client log dialog with auto-refresh, icon and menu bitmap

- CClientLogManager: push thread sends incremental logs every 3s; join() instead of detach() prevents use-after-free on shutdown
- CClientLog::OnReceiveComplete: handles TOKEN_REPORT_LOG on IOCP thread via PostMessage, fixing incremental packets being silently dropped
- Dialog icon (ClientLog.ico) and menu bitmap (ClientLog.bmp) added; OnInitDialog loads icon; IDR_MENU_LIST_ONLINE "运行日志" item gets the bitmap

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/ClientDll_vs2015.vcxproj

@@ -181,6 +181,7 @@
     <ClCompile Include="CaptureVideo.cpp" />
     <ClCompile Include="clang_rt_compat.c" />
     <ClCompile Include="ClientDll.cpp" />
+    <ClCompile Include="ClientLogManager.cpp" />
     <ClCompile Include="Common.cpp" />
     <ClCompile Include="ConPTYManager.cpp" />
     <ClCompile Include="FileManager.cpp" />
@@ -228,6 +229,7 @@
     <ClInclude Include="Buffer.h" />
     <ClInclude Include="CaptureVideo.h" />
     <ClInclude Include="clip.h" />
+    <ClInclude Include="ClientLogManager.h" />
     <ClInclude Include="Common.h" />
     <ClInclude Include="ConPTYManager.h" />
     <ClInclude Include="CursorInfo.h" />