<fix>[zwatch]: add hidden column to AlarmVO/EventSubscriptionVO

Add hidden columns to V5.5.12__schema.sql: CALL ADD_COLUMN for AlarmVO.hidden and EventSubscriptionVO.hidden (TINYINT(1) default 0) to support DB-level soft-hide of AI system alarms when AI license is absent.

Resolves: ZSTAC-83966

Change-Id: Ic660df81e306f8cb64348289604810c27dd63ae0

Author: chao.he

conf/db/upgrade/V5.5.12__schema.sql

@@ -186,3 +186,7 @@ INSERT IGNORE INTO `ActiveAlarmTemplateVO` (`uuid`,`alarmName`,`comparisonOperat
 
 -- ZSTAC-74908: Add resourceType to TagPatternVO to scope AI model tags away from VM pages
 CALL ADD_COLUMN('TagPatternVO', 'resourceType', 'VARCHAR(128)', 1, NULL);
+
+-- ZSTAC-83966: Add hidden field to AlarmVO and EventSubscriptionVO for soft-hide support
+CALL ADD_COLUMN('AlarmVO', 'hidden', 'TINYINT(1)', 0, '0');
+CALL ADD_COLUMN('EventSubscriptionVO', 'hidden', 'TINYINT(1)', 0, '0');