Adopt native Liquibase integration for swatch-billable-usage by moving changelogs to the service module.

Acceptance Criteria

• swatch-billable-usage migration scripts present in swatch-billable-usage module
• swatch-billable-usage can start independently with proper database initialization
• swatch-billable-usage ClowdApp YAML updated to adopt native framework migration execution
• swatch-db-changelog-cleanup job available for swatch-billable-usage to release stuck locks
• Transfer swatch-billable-usage migrations from swatch-database-migrations to service module