fix: add UCI permissions to secubox ACL for settings page
Resolved RPC error "Permission denied" when accessing /admin/secubox/settings
Changes:
- Added UCI read permissions (get, state) to luci-app-secubox ACL
- Added UCI write permissions (set, delete, commit, apply) to luci-app-secubox ACL
- Added "secubox" to UCI config permissions (read and write)
- Added missing ksm_manager module to secubox config
The settings page requires UCI access to load and save the secubox configuration.
Without these permissions, users got "ubus code 6: Permission denied" errors.
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>