Add basic symlink handling in the layer scanning implementation. A new field (targetPath) was added to the internal fileNode struct to store the symlink target path. Next steps include testing hardlinks and handling symlinks during layer tracing.

Add basic symlink handling in the layer scanning implementation. A new field (targetPath) was added to the internal fileNode struct to store the symlink target path. Next steps include testing hardlinks and handling symlinks during layer tracing. #1920