feat(chart): configurable Redis persistence/affinity, rserve probe tuning, LB annotations

[anchapin]

Summary

Makes Redis persistence and node affinity optional (toggleable), makes rserve liveness probe parameters configurable, and adds LoadBalancer annotation support.

Changes

redis-deploy.yaml

• Node affinity block now conditional on redis.affinity.enabled
• Affinity key/values configurable (redis.affinity.nodegroupKey, nodegroupValues)
• Allows Redis to schedule on clusters without the web-group node label

redis-pvc.yaml

• PVC gated by redis.persistence.enabled
• Volume in deploy.yaml switches to emptyDir when persistence.enabled: false
• Useful for ephemeral/dev deployments or when Redis data is disposable

rserve-deploy.yaml

• Liveness probe now fully configurable:
  rserve.livenessProbe.initialDelaySeconds/periodSeconds/timeoutSeconds/failureThreshold
• Defaults: 30s delay, 60s period, 30s timeout, 6 failures (more tolerant of NFS latency spikes)

loadbalancer.yaml

• Adds {{- with .Values.load_balancer.annotations }} block for AWS NLB/ALB annotations
  (e.g. service.beta.kubernetes.io/aws-load-balancer-type: nlb)

Values Added

redis.affinity.enabled, redis.affinity.nodegroupKey, redis.affinity.nodegroupValues
redis.persistence.enabled  (default: true)
rserve.livenessProbe.initialDelaySeconds/periodSeconds/timeoutSeconds/failureThreshold
load_balancer.annotations: {}