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.cpp

@@ -0,0 +1,60 @@
+// UserInputUtils.cpp
+
+#include "StdAfx.h"
+
+#include "Common/StdInStream.h"
+#include "Common/StringConvert.h"
+
+#include "UserInputUtils2.h"
+
+static const char kYes = 'Y';
+static const char kNo = 'N';
+static const char kYesAll = 'A';
+static const char kNoAll = 'S';
+static const char kAutoRename = 'U';
+static const char kQuit = 'Q';
+
+static const char *kFirstQuestionMessage = "?\n";
+static const char *kHelpQuestionMessage =
+  "(Y)es / (N)o / (A)lways / (S)kip all / A(u)to rename / (Q)uit? ";
+
+// return true if pressed Quite;
+// in: anAll
+// out: anAll, anYes;
+
+NUserAnswerMode::EEnum ScanUserYesNoAllQuit2(CStdOutStream *outStream)
+{
+  (*outStream) << kFirstQuestionMessage;
+  for(;;)
+  {
+    (*outStream) << kHelpQuestionMessage;
+	AString scannedString;
+	g_StdIn.ScanAStringUntilNewLine(scannedString);
+    scannedString.Trim();
+    if(!scannedString.IsEmpty())
+      switch(::MyCharUpper(scannedString[0]))
+      {
+        case kYes:
+          return NUserAnswerMode::kYes;
+        case kNo:
+          return NUserAnswerMode::kNo;
+        case kYesAll:
+          return NUserAnswerMode::kYesAll;
+        case kNoAll:
+          return NUserAnswerMode::kNoAll;
+        case kAutoRename:
+          return NUserAnswerMode::kAutoRename;
+        case kQuit:
+          return NUserAnswerMode::kQuit;
+      }
+  }
+}
+
+UString GetPassword(CStdOutStream *outStream)
+{
+  (*outStream) << "\nEnter password:";
+  outStream->Flush();
+  AString oemPassword;
+  g_StdIn.ScanAStringUntilNewLine(oemPassword);
+  return MultiByteToUnicodeString(oemPassword, CP_OEMCP);
+}