feat(pipeline): add e2e orders master medallion flow and dbt models

dbt/models/gold/gold_regional_waste_metrics.sql

@@ -0,0 +1,16 @@
+-- dbt Gold Regional Waste Revenue & Compliance Mart
+SELECT 
+  region_zone,
+  facility_type,
+  waste_category,
+  COUNT(order_id) AS total_orders,
+  COUNT(DISTINCT facility_id) AS active_facilities_count,
+  COUNT(DISTINCT generator_company) AS active_generators_count,
+  ROUND(SUM(volume_ton), 2) AS total_waste_volume_ton,
+  ROUND(SUM(total_order_amount), 2) AS total_gross_revenue,
+  ROUND(AVG(total_order_amount / NULLIF(volume_ton, 0)), 2) AS avg_revenue_per_ton,
+  COUNT(CASE WHEN environmental_compliance_status = 'COMPLIANT' THEN 1 END) AS compliant_orders_count,
+  CURRENT_TIMESTAMP AS mart_refreshed_at
+FROM {{ ref('silver_waste_manifest_enriched') }}
+GROUP BY region_zone, facility_type, waste_category
+ORDER BY total_waste_volume_ton DESC