k8s/messaging: add kafka kmsvc and temporal workflows

- Kafka 3-broker cluster (RF=3, min-ISR=2)
- kmsvc SQS-like API on Kafka
- Redis dedup (standalone, can extend to HA)
- Temporal workflow orchestration (Cassandra backend)

k8s/sqs/charts/kafka-cluster/templates/kafka-cluster.yaml

@@ -0,0 +1,30 @@
+apiVersion: kafka.strimzi.io/v1beta2
+kind: Kafka
+metadata:
+  name: {{ .Values.clusterName }}
+  namespace: {{ .Values.namespace }}
+  annotations:
+    strimzi.io/node-pools: enabled
+    strimzi.io/kraft: enabled
+spec:
+  kafka:
+    version: 4.0.0
+    metadataVersion: 4.0-IV3
+    listeners:
+      - name: plain
+        port: 9092
+        type: internal
+        tls: false
+      - name: tls
+        port: 9093
+        type: internal
+        tls: true
+    config:
+      default.replication.factor: {{ .Values.kafka.replicationFactor }}
+      min.insync.replicas: {{ .Values.kafka.minInsyncReplicas }}
+      offsets.topic.replication.factor: {{ .Values.kafka.replicationFactor }}
+      transaction.state.log.replication.factor: {{ .Values.kafka.replicationFactor }}
+      transaction.state.log.min.isr: {{ .Values.kafka.minInsyncReplicas }}
+  entityOperator:
+    topicOperator: {}
+    userOperator: {}

k8s/sqs/charts/kafka-cluster/templates/kafka-nodepool.yaml

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+apiVersion: kafka.strimzi.io/v1beta2
+kind: KafkaNodePool
+metadata:
+  name: {{ .Values.clusterName }}-pool
+  namespace: {{ .Values.namespace }}
+  labels:
+    strimzi.io/cluster: {{ .Values.clusterName }}
+spec:
+  replicas: {{ .Values.nodePool.replicas }}
+  roles:
+    - controller
+    - broker
+  storage:
+    type: persistent-claim
+    size: {{ .Values.nodePool.storage.sizeGi }}Gi
+    class: {{ .Values.nodePool.storage.class }}
+    deleteClaim: false
+  resources:
+    limits:
+      memory: {{ .Values.nodePool.resources.memory }}
+      cpu: {{ .Values.nodePool.resources.cpu | quote }}
+    requests:
+      memory: {{ .Values.nodePool.resources.memory }}
+      cpu: {{ .Values.nodePool.resources.cpu | quote }}
+  template:
+    pod:
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+            - weight: 100
+              podAffinityTerm:
+                topologyKey: {{ .Values.nodePool.antiAffinityTopologyKey }}
+                labelSelector:
+                  matchLabels:
+                    strimzi.io/cluster: {{ .Values.clusterName }}
+    kafkaContainer:
+      env:
+        - name: KAFKA_HEAP_OPTS
+          value: {{ .Values.nodePool.heapOpts | quote }}

k8s/sqs/charts/kafka-cluster/templates/storageclass.yaml

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+{{- if eq .Values.nodePool.storage.class "longhorn-kafka" }}
+# The default "longhorn" StorageClass requests 3 replicas across 3 zone-labeled
+# nodes (az-a/az-b/az-c). With Longhorn's zone-aware anti-affinity, replicas
+# spread 1-per-zone for durability.
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: longhorn-kafka
+provisioner: driver.longhorn.io
+allowVolumeExpansion: true
+reclaimPolicy: Delete
+volumeBindingMode: Immediate
+parameters:
+  numberOfReplicas: "3"
+  staleReplicaTimeout: "30"
+  fromBackup: ""
+  fsType: "ext4"
+  dataLocality: "disabled"
+{{- end }}