feat(25.01): add bundle wrapper directory with NSIS sources and vendor symlinks

Mirror the 26.00-bundle / 26.01-bundle approach for 25.01:

- versions/25.01-bundle/CPP/7zip/Bundles/Nsis7z/: project-owned NSIS plugin
  wrapper sources (api.h, nsis7z.cpp, pluginapi.*, resource.*, StdAfx*,
  Nsis7z.sln, Nsis7z.vcxproj, Nsis7z.vcxproj.filters, Nsis7z_vs2026.vcxproj).
- versions/25.01-bundle/CPP/7zip/UI/NSIS/: NSIS UI sources; StdAfx.h patched
  to use relative include path and MinGW-compatible Windows.h guard (the
  upstream 25.01 file used an absolute path incompatible with the bundle layout).
- versions/25.01-bundle/CPP/7zip/LzmaDec_gcc.mak: forwarding stub.
- versions/25.01-bundle/{C,Asm} and CPP sub-trees: symlinks into versions/25.01/.
- tools/linux/setup_25_01_bundle_symlinks.py: idempotent symlink-recreation script.

versions/25.01-bundle/CPP/7zip/UI/NSIS/UserInputUtils2.h

@@ -0,0 +1,24 @@
+// UserInputUtils.h
+
+#ifndef __USERINPUTUTILS_H
+#define __USERINPUTUTILS_H
+
+#include "Common/StdOutStream.h"
+
+namespace NUserAnswerMode {
+
+enum EEnum
+{
+  kYes,
+  kNo,
+  kYesAll,
+  kNoAll,
+  kAutoRename,
+  kQuit
+};
+}
+
+NUserAnswerMode::EEnum ScanUserYesNoAllQuit2(CStdOutStream *outStream);
+UString GetPassword(CStdOutStream *outStream);
+
+#endif