Add reverse proxy helm chart

[lixmal]

Summary

Adds a Helm chart for deploying the NetBird reverse proxy.

Kubernetes Resources

Resource	Condition	Description
Deployment	Always	Proxy deployment with health probes, configurable cert and data volumes
Service	Always	Dual-stack (IPv4/IPv6) support, conditional ACME HTTP, NetBird UDP, and extra ports
ServiceAccount	serviceAccount.create	With configurable token automount (required for k8s-lease cert locking)
Secret	proxyToken set (no existingSecret)	Proxy token and optional OIDC client secret
PersistentVolumeClaim	certVolume.enabled or geolocation.volume.enabled	Shared certificate storage and geolocation database
Role	rbac.create	Grants Kubernetes lease permissions for ACME certificate locking
RoleBinding	Same as Role	Binds the lease Role to the ServiceAccount
HorizontalPodAutoscaler	autoscaling.enabled	CPU and memory based autoscaling
PodDisruptionBudget	podDisruptionBudget.enabled	Configurable minAvailable or maxUnavailable
NetworkPolicy	networkPolicy.enabled	Restricts ingress to proxy ports with support for additional custom rules
ServiceMonitor	serviceMonitor.enabled	Prometheus scraping on the health port

[EvantAiI]

Hello when do you think the chart will be ready to deploy ?
Does the maintainer of the repo reviewed the pr ? Cause i don't see any movements from the owners unless the kube-operator...