fix(meshcentral): remove unused NFS modules after Wave 2 storage migration

MeshCentral was migrated from NFS to proxmox-lvm storage (Wave 2). The old NFS
modules for data and files are no longer used by the deployment, leaving behind
orphaned PVCs (meshcentral-data, meshcentral-files). The backups volume remains
on NFS per the backup strategy pattern.

Changes:
- Removed module.nfs_data and module.nfs_files from Terraform config
- Active volumes now: meshcentral-data-proxmox, meshcentral-files-proxmox (proxmox-lvm)
- Backups volume: meshcentral-backups (NFS) - unchanged

Pod status: healthy, running on proxmox-lvm volumes.

stacks/meshcentral/main.tf

@@ -21,22 +21,6 @@ module "tls_secret" {
   tls_secret_name = var.tls_secret_name
 }
 
-module "nfs_data" {
-  source     = "../../modules/kubernetes/nfs_volume"
-  name       = "meshcentral-data"
-  namespace  = kubernetes_namespace.meshcentral.metadata[0].name
-  nfs_server = var.nfs_server
-  nfs_path   = "/mnt/main/meshcentral/meshcentral-data"
-}
-
-module "nfs_files" {
-  source     = "../../modules/kubernetes/nfs_volume"
-  name       = "meshcentral-files"
-  namespace  = kubernetes_namespace.meshcentral.metadata[0].name
-  nfs_server = var.nfs_server
-  nfs_path   = "/mnt/main/meshcentral/meshcentral-files"
-}
-
 resource "kubernetes_persistent_volume_claim" "data_proxmox" {
   wait_until_bound = false
   metadata {