feat: add ACL user management, memory doctor, and cluster slot map}
- Add visual ACL user editor (create/edit/delete) across Angular, React,
and Vue with chip-based permission fields, enable/disable toggle, and
no-password option
- Add ACL user dialog component and service for Angular, AclUserDialog
for React, and AclUserDialog.vue for Vue
- Add Memory Doctor diagnostics panel with auto-refresh toggle to the
memory analysis page across all three frontends
- Add Cluster Slot Map table showing shard ranges, slot counts, and
replicas with auto-refresh and export in the monitoring page
- Add slow log reset button with confirmation dialog
- Add guards preventing deletion of the default user or currently
connected user, hide edit controls in readonly mode
- Add i18n strings for ACL, memory doctor, cluster slot map, and slow
log reset across all 54+ languages
- Add Playwright test specs for the new features
- Update README with ACL management documentation
- Bump version to 2026.4.437