1. Share password bypass (HIGH): enforce password check in get_shared_link_by_token,
verify_shared_link_password now returns ShareDto only on correct password.
2. WebDAV MOVE ownership (MEDIUM): add assert_owner on destination parent folder
for file moves in both PathResolver and legacy branches.
3. Path traversal defense-in-depth (LOW): add reject_path_traversal() to WebDAV,
CalDAV, and CardDAV handlers rejecting '..' segments at HTTP boundary.
4. Setup race condition (LOW): atomic INSERT ... ON CONFLICT DO NOTHING in
try_claim_initialization prevents duplicate admin creation.
Dionisio
4197cc3b7b