- Add roadmaps table for roadmap persistence with id, title, description, timestamps
- Add roadmap_milestones table with FK cascade to roadmaps and orderIndex for deterministic sorting
- Add roadmap_features table with FK cascade to milestones and orderIndex for feature ordering
- Add project_insights table for normalized insight entities with category, status, fingerprint fields
- Add project_insight_runs table for insight-generation run records with trigger, status, counts
- Add covering indexes for milestone/feature ordering and insight filtering by projectId, category, fingerprint
