GHSA-QQQM-5547-774X FileBrowser Quantum: Path traversal in public share PATCH allows file ops outside shared directory

Summary publicPatchHandler in backend/http/public.go joins user-controlled fromPath and toPath body fields with the trusted d.share.Path BEFORE the downstream sanitizer runs. Because filepath.Join collapses .. segments during the join, the sanitizer in resourcePatchHandler never sees the traversa...