自动关闭 + 留言通知 1.1.2

FIX: Thread inactivity notices now show the scheduled auto-close date when auto-close applies
FIX: Auto-close backlog rebuild batch size is capped at 1000 to prevent oversized rebuild batches
UPDATE: Rebuild tool help text now mentions the 1000 item batch limit
UPDATE: Thread inactivity notices now show scheduled auto-close dates with full month names and ordinal day suffixes