[Build] Keep Windows installs free of build-tree artifacts

Several Windows packaging gaps could leak Visual Studio CMake build
output into the installed application or the NSIS installer:

- The per-app DLL sweep used
  ${CMAKE_BINARY_DIR}/${PROJECT_NAME}/${CMAKE_BUILD_TYPE}, which is
  empty on multi-config generators, collapsing the recursive
  DIRECTORY install into the whole build tree (containing *.dir,
  *_autogen, .qt, .qsb, x64, ...). Point it at the real per-config
  output with $<TARGET_FILE_DIR:...> and exclude build artifacts.
- install(FILES ${OPENSSL_INCLUDE_DIRS} ...) tried to install OpenSSL
  include directories as files. CMake refuses this
  ("install FILES given directory"); it only slipped through CI
  because the vcpkg OpenSSL config leaves the variable empty. Remove it;
  fixup_bundle already ships the OpenSSL runtime DLLs.
- The NSIS uninstaller only deleted *.exe/*.dll and a few known files,
  so build-tree leftovers survived an uninstall/reinstall cycle. Wipe
  the whole directory tree instead.
- Add a Windows CI gate that lists the packaged installer with 7-Zip
  and fails the build if any build-tree artifact path is found.

.ci/compile.sh

@@ -327,4 +327,30 @@ if [[ $MAKE_PACKAGE ]]; then
     BUILD_DIR="$BUILD_DIR" .ci/name_build.sh "$PACKAGE_SUFFIX"
     echo "::endgroup::"
   fi
+
+  if [[ $RUNNER_OS == Windows ]]; then
+    echo "::group::Check installer for build-tree artifacts"
+    cd "$BUILD_DIR"
+    package="$(find . -maxdepth 1 -type f -name 'Cockatrice-*.exe' -print -quit)"
+    if [[ ! $package ]]; then
+      echo "::error file=$0::could not find installer to inspect"
+      exit 1
+    fi
+    seven_zip="$(command -v 7z || true)"
+    if [[ ! $seven_zip ]]; then
+      seven_zip="/c/Program Files/7-Zip/7z.exe"
+    fi
+    if [[ ! -f $seven_zip ]]; then
+      echo "::warning file=$0::7-Zip not found, skipping installer content check"
+    else
+      echo "Inspecting $package"
+      if "$seven_zip" l "$package" |
+        grep -E "_autogen|\.dir[\\/]|\.tlog|(^|[\\/])x64[\\/]|(^|[\\/])\.qt[\\/]|(^|[\\/])\.qsb[\\/]|(^|[\\/])\.lupdate[\\/]|CMakeFiles"; then
+        echo "::error file=$0::installer contains build-tree artifacts"
+        exit 1
+      fi
+      echo "Installer content is clean."
+    fi
+    echo "::endgroup::"
+  fi
 fi