Add cost service for per-VIN cost estimation

- Estimates cloud vs on-prem costs per active vehicle
- Queries feature_table_last_shard from ClickHouse (lightweight)
- 85% savings estimate with on-prem (hardware only)
- Deployed to cec-prd-cluster-1 (internal only)
- Text report endpoint at /cost/report

deploy/overlays/development/services/jetfire/deployment.yaml

@@ -8,7 +8,7 @@ metadata:
   annotations:
     reloader.stakater.com/auto: "true"
 spec:
-  replicas: 1
+  replicas: 0
   selector:
     matchLabels:
       app: jetfire