#791 Schema inconsistency: tables split between public and highway schemas

Tables are inconsistently placed between schemas: - public: workflow_run, highway_lifecycle_log, human_approvals, api_keys - highway: apps, app_versions, tenant_app_installations, event_subscriptions This caused the trigger migration to fail silently when referencing highway.workflow_run instead of public.workflow_run. Action items: 1. Audit all table locations 2. Decide on unified schema strategy 3. Create migration to consolidate (if feasible) 4. Update all future migrations to use explicit schema prefixes