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/cec-prd-cluster/cost.yaml

@@ -0,0 +1,86 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: cost
+  namespace: default
+  labels:
+    app: cost
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: cost
+  template:
+    metadata:
+      labels:
+        app: cost
+    spec:
+      containers:
+        - name: cost
+          image: fiskercloud.azurecr.io/cost:v5
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 8077
+              name: http
+            - containerPort: 11011
+              name: health
+          env:
+            - name: CLICKHOUSE_HOST
+              value: clickhouse.clickhouse.svc.cluster.local
+            - name: CLICKHOUSE_PORT
+              value: "9000"
+            - name: CLICKHOUSE_USER
+              value: default
+            - name: CLICKHOUSE_PASS
+              valueFrom:
+                secretKeyRef:
+                  name: cloud
+                  key: CLICKHOUSE_PASS
+            - name: CLICKHOUSE_DB
+              value: default
+            - name: REMOTE_CLICKHOUSE_HOST
+              value: clickhouse.clickhouse.svc.cluster.local
+            - name: REMOTE_CLICKHOUSE_PORT
+              value: "9000"
+            - name: REMOTE_CLICKHOUSE_USER
+              value: default
+            - name: REMOTE_CLICKHOUSE_PASS
+              valueFrom:
+                secretKeyRef:
+                  name: cloud
+                  key: CLICKHOUSE_PASS
+            - name: REMOTE_CLICKHOUSE_DB
+              value: default
+            - name: COLLECTOR_INTERVAL_MINUTES
+              value: "15"
+          resources:
+            requests:
+              cpu: 100m
+              memory: 128Mi
+            limits:
+              memory: 256Mi
+          livenessProbe:
+            httpGet:
+              path: /liveness
+              port: 11011
+            initialDelaySeconds: 10
+            periodSeconds: 30
+          readinessProbe:
+            httpGet:
+              path: /readiness
+              port: 11011
+            initialDelaySeconds: 5
+            periodSeconds: 10
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: cost
+  namespace: default
+spec:
+  selector:
+    app: cost
+  ports:
+    - port: 8077
+      targetPort: 8077
+      name: http