fs: fix cpSync directory iterator exception

This patch prevents process abort when fs.cpSync() encounters errors
while iterating directories with non-ASCII characters in paths.

Previously, std::filesystem::directory_iterator was constructed without
an error_code parameter, causing it to throw std::filesystem::filesystem_error
on failure. When the underlying libc++ implementation (especially in Electron)
has bugs handling GBK-encoded paths on Windows, this uncaught exception
triggers __libcpp_verbose_abort(), causing the process to crash.

The crash cannot be caught by JavaScript try-catch blocks since it occurs
at the C++ layer below the Node.js binding.

This fix changes the directory_iterator construction to use the error_code
overload, consistent with other std::filesystem operations in this file.
If an error occurs, it is properly converted to a JavaScript exception
via env->ThrowStdErrException(), allowing user code to handle it gracefully.

Author: gushiaoke

src/node_file.cc

@@ -3738,7 +3738,13 @@ static void CpSyncCopyDir(const FunctionCallbackInfo<Value>& args) {
                        &isolate](std::filesystem::path src,
                                  std::filesystem::path dest) {
     std::error_code error;
-    for (auto dir_entry : std::filesystem::directory_iterator(src)) {
+    std::filesystem::directory_iterator dir_it(src, error);
+    if (error) {
+      auto src_str = ConvertPathToUTF8(src);
+      env->ThrowStdErrException(error, "cp", src_str.c_str());
+      return false;
+    }
+    for (auto dir_entry : dir_it) {
       auto dest_file_path = dest / dir_entry.path().filename();
       auto dest_str = ConvertPathToUTF8(dest);