fix(helm): remove busybox init container blocking backend startup

BusyBox 1.37 nc -z is broken (outputs "punt!" and never exits),
causing the wait-for-cache init container to loop indefinitely.
The cache is healthy — the backend should handle reconnects itself.

backend/deploy/helm/templates/deployment.yaml

@@ -29,29 +29,6 @@ spec:
       imagePullSecrets:
         {{- toYaml . | nindent 8 }}
       {{- end }}
-      {{- if .Values.dragonfly.enabled }}
-      initContainers:
-        - name: wait-for-cache
-          image: busybox:1.37
-          resources:
-            requests:
-              cpu: 10m
-              memory: 16Mi
-            limits:
-              cpu: 50m
-              memory: 32Mi
-          securityContext:
-            {{- toYaml .Values.securityContext | nindent 12 }}
-          command:
-            - sh
-            - -c
-            - |
-              echo "Waiting for cache..."
-              until nc -z {{ .Values.dragonfly.name }} 6379; do
-                sleep 3
-              done
-              echo "Cache is reachable"
-      {{- end }}
       containers:
         - name: backend
           image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"