- GOMEMLIMIT: remove 256MB RAM threshold cap. Now applies to ALL
devices. Formula: min(35% RAM, 512MB). mem_scale respected.
Fixes sing-box eating 500MB+ on 2GB routers with no limit.
- Cascade delete: when a routing section is deleted, child UCI entries
(subscription_url, urltest, priority_group, priority_level,
section_interface) are now removed. Prevents orphaned entries that
corrupt config generation.
- Migration cleanup: orphan_section_interfaces now cleans ALL child
types, not just section_interface.
- Watchdog logread: kill orphans in stop_runtime(), add SIGTERM/SIGINT
handlers in uloop mode (previously only in fallback mode).