State enforcement aggregates

State-level aggregates + top employers + top industries.

Powers the /state/[slug] SEO landing pages. Returns:

• state: 2-letter code and full name
• totals: inspections, violations, penalties, fatalities, WHD backwages, employer count in one pass
• top_by_violations: top 50 employers ordered by osha_violations
• top_by_penalties: top 50 by osha_total_penalties
• top_by_fatalities: top 20 by osha_fatalities (only non-zero)
• top_naics: top 10 industries by violation volume in this state
• top_contractors: top 10 federal contractors by 5yr obligations (only populated once USAspending has landed; empty list otherwise)