Add xdsgui module: prebuilt binary + generate_XDS.INP from XDS wiki

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

xdsgui/modulefile

@@ -0,0 +1,15 @@
+#%Module1.0
+
+module-whatis       "XDSGUI - graphical user interface for XDS data processing"
+module-url          "https://wiki.uni-konstanz.de/xds/index.php/XDSGUI"
+module-license      "free of charge (see module-url)"
+module-maintainer   "MX Data <jiaxin.duan@psi.ch>"
+
+module-help     "
+XDSGUI: a GUI for XDS that visualizes control images and statistics,
+and helps beginners and experts with data processing. Also installs
+the generate_XDS.INP helper script. Loading this module pulls in
+H5ToXds, xds and autoPROC as runtime dependencies.
+"
+
+prepend-path    PATH    $PREFIX/bin