mdssvc: fix Spotlight queries restricted to subdirectories with NFD paths

mdssvc: fix Spotlight queries restricted to subdirectories with NFD paths

Ensure directory scopes match by aligning Unicode normalization forms.
This fixes the case when the macOS client restricts the search to
a subdirectory. macOS clients transmit paths using NFD, which can
cause lookups to fail against NFC systems used by Samba and Elasticsearch.

This commit also includes a bug fix by Ralph Boehme <slow@samba.org> to resolve a
null-termination issue of the NFD converted path in add_filemeta().

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15379

Signed-off-by: Priyanka Soni <priysoni@redhat.com>
Reviewed-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>
Autobuild-User(master): Günther Deschner <gd@samba.org>
Autobuild-Date(master): Tue Jul 14 14:22:46 UTC 2026 on atb-devel-224