Add hierarchical state support to StatusFlow

[moqui-industrial]

Adds hierarchical StatusFlow support with parent-child flow relationships, cross-flow transitions, and append-only StatusFlowStack tracking.

Schema impact:

• adds parentStatusFlowId to StatusFlow
• adds toStatusFlowId to the StatusFlowTransition primary key
• replaces the original StatusFlowStack shape with append-only event rows

Compatibility and migration impact:

• existing StatusFlowTransition data requires migration because the primary key changes
• this is not a purely additive schema change

Files changed:

• framework/entity/BasicEntities.xml

Validation performed:

• git diff --check
• xmllint --noout on framework/entity/BasicEntities.xml
• local dependency search for StatusFlow, StatusFlowTransition, statusFlowId, toStatusFlowId, and StatusFlowStack

This PR supersedes the hierarchical StatusFlow portion of #720.