cost service v13: lower per-VIN estimates to 3mc/10MB

- Per-VIN marginal: 3 millicores / 10MB (was 50mc/80MB)
- Based on ~3000 VINs using ~10 cores / 30GB marginal on top of platform base
- Total fleet now shows realistic: 87 cores / 569GB for 2463 VINs
- Updated README with v13 output

deploy/cec-prd-cluster/cost.yaml

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
         - name: cost
-          image: fiskercloud.azurecr.io/cost:v12
+          image: fiskercloud.azurecr.io/cost:v13
           imagePullPolicy: IfNotPresent
           ports:
             - containerPort: 8077