feat: add Helmfile-managed k8s charts for tasks 10-13

Local charts: kafka-cluster (Strimzi Kafka+KafkaNodePool CRs, 3-replica KRaft
topology, 5Gi memory cap, Longhorn storage, pod anti-affinity), queue-crd
(Queue CRD + queue-operator Deployment/RBAC), management-service
(Deployment/Service/ConfigMap/HPA/Ingress, REST exposed externally via
cert-manager-issued TLS, raw gRPC kept cluster-internal per design.md §7a).

helmfile.yaml.gotmpl + releases.d/*.gotmpl wire strimzi-operator ->
kafka-cluster -> redis -> {queue-crd, management-service} via `needs:`.
Directory is releases.d, not helmfile.d as originally sketched in design.md
section 7b: Helmfile v1 treats a literal "helmfile.d" directory as a special
auto-discovery mode that conflicts with an explicit top-level helmfile.yaml.
Files use .gotmpl (required by Helmfile v1 for {{ }}-templated files) and
each declares its own environments: block, since nested helmfiles don't
inherit the parent's resolved values in this version.

Namespace is sqs throughout. environments/homelab.yaml carries no secrets.
Validated locally via helm lint/helm template (all 3 charts) and
`helmfile -e homelab build` (dependency ordering + value substitution) — no
cluster contact made. Live apply is a separate, explicitly-confirmed step.

k8s/releases.d/00-strimzi-operator.yaml.gotmpl

@@ -0,0 +1,16 @@
+environments:
+  homelab:
+    values:
+      - ../environments/homelab.yaml
+---
+repositories:
+  - name: strimzi
+    url: https://strimzi.io/charts/
+
+releases:
+  - name: strimzi-operator
+    namespace: {{ .Values.namespace }}
+    chart: strimzi/strimzi-kafka-operator
+    version: 0.46.0
+    values:
+      - watchNamespaces: ["{{ .Values.namespace }}"]

k8s/releases.d/01-kafka-cluster.yaml.gotmpl

@@ -0,0 +1,21 @@
+environments:
+  homelab:
+    values:
+      - ../environments/homelab.yaml
+---
+releases:
+  - name: kafka-cluster
+    namespace: {{ .Values.namespace }}
+    chart: ../charts/kafka-cluster
+    needs:
+      - {{ .Values.namespace }}/strimzi-operator
+    values:
+      - namespace: {{ .Values.namespace }}
+        nodePool:
+          replicas: {{ .Values.kafkaCluster.nodePool.replicas }}
+          storage:
+            class: {{ .Values.kafkaCluster.nodePool.storage.class }}
+            sizeGi: {{ .Values.kafkaCluster.nodePool.storage.sizeGi }}
+          resources:
+            memory: {{ .Values.kafkaCluster.nodePool.resources.memory }}
+            cpu: {{ .Values.kafkaCluster.nodePool.resources.cpu | quote }}

k8s/releases.d/02-redis.yaml.gotmpl

@@ -0,0 +1,28 @@
+environments:
+  homelab:
+    values:
+      - ../environments/homelab.yaml
+---
+repositories:
+  - name: bitnami
+    url: https://charts.bitnami.com/bitnami
+
+releases:
+  - name: kmsvc-redis
+    namespace: {{ .Values.namespace }}
+    chart: bitnami/redis
+    version: 20.6.0
+    values:
+      - architecture: standalone
+        auth:
+          enabled: false
+        master:
+          persistence:
+            enabled: true
+            storageClass: {{ .Values.redis.storageClass }}
+            size: 2Gi
+          resources:
+            limits:
+              memory: {{ .Values.redis.memoryLimit }}
+            requests:
+              memory: {{ .Values.redis.memoryLimit }}

k8s/releases.d/03-queue-crd.yaml.gotmpl

@@ -0,0 +1,16 @@
+environments:
+  homelab:
+    values:
+      - ../environments/homelab.yaml
+---
+releases:
+  - name: queue-crd
+    namespace: {{ .Values.namespace }}
+    chart: ../charts/queue-crd
+    needs:
+      - {{ .Values.namespace }}/kafka-cluster
+      - {{ .Values.namespace }}/kmsvc-redis
+    values:
+      - namespace: {{ .Values.namespace }}
+        kafkaBrokers: "kmsvc-kafka-bootstrap.{{ .Values.namespace }}.svc.cluster.local:9092"
+        redisAddr: "kmsvc-redis-master.{{ .Values.namespace }}.svc.cluster.local:6379"

k8s/releases.d/04-management-service.yaml.gotmpl

@@ -0,0 +1,23 @@
+environments:
+  homelab:
+    values:
+      - ../environments/homelab.yaml
+---
+releases:
+  - name: management-service
+    namespace: {{ .Values.namespace }}
+    chart: ../charts/management-service
+    needs:
+      - {{ .Values.namespace }}/kafka-cluster
+      - {{ .Values.namespace }}/kmsvc-redis
+    values:
+      - namespace: {{ .Values.namespace }}
+        env:
+          kafkaBrokers: "kmsvc-kafka-bootstrap.{{ .Values.namespace }}.svc.cluster.local:9092"
+          redisAddr: "kmsvc-redis-master.{{ .Values.namespace }}.svc.cluster.local:6379"
+          authentikIssuerURL: {{ .Values.managementService.authentikIssuerURL | quote }}
+          authentikAudience: {{ .Values.managementService.authentikAudience | quote }}
+        ingress:
+          enabled: true
+          host: {{ .Values.managementService.ingress.host | quote }}
+          clusterIssuer: {{ .Values.managementService.ingress.clusterIssuer | quote }}