feat(spark): add Spark History Server Deployment and Service

The Bitnami spark chart 9.2.10 does not render a history server despite
historyServer.enabled=true in values. Add an explicit Deployment and
ClusterIP Service (spark-history-server-svc:18080) using the same
bitnami/spark:3.5.2 image, wired to the shared spark-events PVC.
The existing spark-history-ingress now has a valid backend.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

spark-cluster/base/history-server.yaml

@@ -0,0 +1,61 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: spark-history-server
+  labels:
+    app.kubernetes.io/name: spark-history-server
+    app.kubernetes.io/part-of: nowchess
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: spark-history-server
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: spark-history-server
+        app.kubernetes.io/part-of: nowchess
+    spec:
+      containers:
+        - name: history-server
+          # Same image version the Bitnami chart deploys for master/workers.
+          image: docker.io/bitnami/spark:3.5.2
+          command:
+            - /opt/bitnami/spark/bin/spark-class
+            - org.apache.spark.deploy.history.HistoryServer
+          env:
+            - name: SPARK_HISTORY_OPTS
+              value: "-Dspark.history.fs.logDirectory=/spark-events"
+          ports:
+            - name: http
+              containerPort: 18080
+          resources:
+            requests:
+              cpu: 100m
+              memory: 512Mi
+            limits:
+              cpu: 500m
+              memory: 1Gi
+          volumeMounts:
+            - name: spark-events
+              mountPath: /spark-events
+      volumes:
+        - name: spark-events
+          persistentVolumeClaim:
+            claimName: spark-events
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: spark-history-server-svc
+  labels:
+    app.kubernetes.io/name: spark-history-server
+    app.kubernetes.io/part-of: nowchess
+spec:
+  selector:
+    app.kubernetes.io/name: spark-history-server
+  ports:
+    - name: http
+      port: 18080
+      targetPort: http
+  type: ClusterIP

spark-cluster/base/kustomization.yaml

@@ -3,6 +3,7 @@ kind: Kustomization
 
 resources:
   - pvc.yaml
+  - history-server.yaml
   - ingress.yaml
 
 helmCharts: