feat: Add carrier connector Kubernetes deployment and integrate charging engine with packet gateway

- Add CHARGING_ENGINE_URL environment variable to packet-gateway deployment (http://charging-engine-service:3001)
- Add carrier-connector Deployment with 2 replicas, telecom/carrier-connector:latest image
- Add carrier-connector container with port 8080, DATABASE_DSN and ES2_URL from ConfigMap
- Add Prometheus scraping annotations (/metrics on port 8080)
- Add resource limits (256Mi memory, 200m CPU)

deployments/kubernetes/manifests/applications.yaml

@@ -242,6 +242,8 @@ spec:
         env:
         - name: REDIS_URL
           value: "redis://redis-service:6379"
+        - name: CHARGING_ENGINE_URL
+          value: "http://charging-engine-service:3001"
         - name: INTERFACE
           value: "eth0"
         - name: LOG_LEVEL
@@ -353,3 +355,83 @@ spec:
     port: 3000
     targetPort: 3000
   type: ClusterIP
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: carrier-connector
+  namespace: telecom-platform
+  labels:
+    app: carrier-connector
+    component: backend
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: carrier-connector
+  template:
+    metadata:
+      labels:
+        app: carrier-connector
+        component: backend
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "8080"
+        prometheus.io/path: "/metrics"
+    spec:
+      containers:
+      - name: carrier-connector
+        image: telecom/carrier-connector:latest
+        ports:
+        - containerPort: 8080
+          name: http
+        env:
+        - name: PORT
+          value: "8080"
+        - name: DATABASE_DSN
+          valueFrom:
+            configMapKeyRef:
+              name: telecom-config
+              key: DATABASE_DSN
+        - name: ES2_URL
+          valueFrom:
+            configMapKeyRef:
+              name: telecom-config
+              key: ES2_URL
+        - name: LOG_LEVEL
+          value: "info"
+        resources:
+          requests:
+            memory: "128Mi"
+            cpu: "100m"
+          limits:
+            memory: "256Mi"
+            cpu: "200m"
+        livenessProbe:
+          httpGet:
+            path: /health
+            port: 8080
+          initialDelaySeconds: 30
+          periodSeconds: 10
+        readinessProbe:
+          httpGet:
+            path: /health/ready
+            port: 8080
+          initialDelaySeconds: 5
+          periodSeconds: 5
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: carrier-connector-service
+  namespace: telecom-platform
+  labels:
+    app: carrier-connector
+spec:
+  selector:
+    app: carrier-connector
+  ports:
+  - name: http
+    port: 8080
+    targetPort: 8080
+  type: ClusterIP