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/NSISBreak.cpp

@@ -0,0 +1,31 @@
+// ConsoleClose.cpp
+
+#include "StdAfx.h"
+
+#include "NSISBreak.h"
+
+static int g_BreakCounter = 0;
+
+namespace NNSISBreak {
+
+void SendBreakSignal()
+{
+	g_BreakCounter++;
+}
+
+bool TestBreakSignal()
+{
+  /*
+  if (g_BreakCounter > 0)
+    return true;
+  */
+  return (g_BreakCounter > 0);
+}
+
+void CheckCtrlBreak()
+{
+  if (TestBreakSignal())
+    throw CCtrlBreakException();
+}
+
+}